JP2008067273A - Message delivery system, message transfer device, message transfer method, and message transfer program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the burden of a user for registering information in a white list and a black list. <P>SOLUTION: A white list automatic processing section 114 of a mail transfer server 110 registers the mail address of its communicating party in the white list when the user transmits a mail to the new communicating party, and registers the mail address of the communicating party in the white list if it is determined that the communicating party is reliable or a mail is returned to the communicating party, when a mail is received from the communicating party who has been registered at neither the white list nor the black list. When a black list automatic processing section 115 of the mail transfer server 110 receives a mail from a communicating party who has been registered at neither the white list nor the black list, the black list automatic processing section 115 registers the mail address of the communicating party in the black list once and then deletes the mail address registered in the black list once when it is determined that the communicating party is reliable. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a message delivery system, a message transfer device, a message transfer method, and a message transfer program that deliver a message based on caller information that is information about a message sender, and in particular, information related to a sender that permits reception. The present invention relates to a message delivery system, a message transfer apparatus, a message transfer method, and a message transfer program that can reduce the burden of registering information related to a sender permitted to be received by a user by eliminating restrictions when automatically registering. .

  In recent years, with the increase in spam mail, various techniques for preventing spam mail have been developed. For example, by registering the mail address of a sender who is allowed to receive mail as a permitted sender address in a mail transfer server that forwards mail, the mail transfer server transfers only mail having the registered address as the sender address. Technology has been developed.

  However, it is a burden on the user to register all e-mail addresses that are permitted to be received. Therefore, a technique for automatically registering an e-mail address that a user permits reception has been developed. For example, Patent Literature 1 describes a technique in which when a user replies to a received mail, the reply destination mail address is automatically registered as a mail address that the user permits to receive.

JP 2003-178008 A

  However, such a conventional technique has a problem that automatic registration is not performed as a mail address that permits reception unless a reply mail is transmitted. Furthermore, there is a restriction that automatic registration will not be performed unless an email is sent from the communication partner.

  The present invention has been made to solve the above-described problems caused by the prior art, and eliminates restrictions on automatic registration of information related to a caller that is permitted to receive, such as a permitted caller address, and thus a user. It is an object of the present invention to provide a message delivery system, a message transfer device, a message transfer method, and a message transfer program that can reduce the burden of registering information related to a caller who permits reception.

  In order to solve the above-described problems and achieve the object, the invention according to claim 1 is a message delivery system that delivers a message based on sender information that is information about the sender of the message, and is received by the user. Permitted caller information storage means for storing one or more caller information for each user, and when the user sends a message to a new communication partner And a permitted caller information automatic registering means for automatically registering information relating to the communication partner in the permitted caller information storage means.

  The invention according to claim 2 is a message delivery system for delivering a message based on caller information that is information related to the sender of the message, and is a permission that is information related to each caller that the user permits to receive. Allowed caller information storage means for storing one or more callers for each user, communication history information storage means for storing communication history information with each communication partner for each user, and the communication history information An authorized caller information automatic deletion unit that specifies and deletes the permitted caller information to be automatically deleted from the permitted caller information storage unit based on the communication history information stored in the storage unit, To do.

  The invention according to claim 3 is the above invention, wherein the communication history information storage means stores a last message communication time as communication history information, and the permitted caller information automatic deletion means is the communication history information storage means. If the difference between the last message communication time stored in the current time and the current time is larger than a predetermined value, the permitted caller information corresponding to the user and the communication partner is automatically deleted from the permitted caller information storage means. It is characterized by that.

  According to a fourth aspect of the present invention, in the above invention, the communication history information storage means stores a last message communication time as communication history information, and the permitted sender information automatic deletion means stores the permitted sender information storage. When the number of permitted sender information stored in the permitted sender information storage means for the user when registering new permitted sender information corresponding to the user in the means is a predetermined maximum value, Of the permitted caller information stored for the user, the permitted caller information regarding the communication partner having the oldest message communication time stored in the communication history storage means is deleted.

  The invention according to claim 5 is a message delivery system for delivering a message based on caller information that is information relating to the sender of the message, and is a permission that is information relating to each caller that the user permits to receive. Allowed caller information storage means storing caller information for one or more callers for each user, and one or more rejected caller information for each user for each caller that the user refuses to receive When registering the rejected caller information storage means stored for the caller and the new permitted caller information storage means, information that matches the new permitted caller information is the rejected caller information. And a permitted sender information registration executing means for deleting the matching information from the rejected sender information storage means when stored in the storage means.

  The invention according to claim 6 is a message delivery system for delivering a message based on caller information that is information relating to the sender of the message, and is a rejection that is information relating to each caller that the user refuses to receive. Rejected caller information storage means for storing one or more callers information for each user, communication history information storage means for storing communication history information with each communication partner for each user, and the communication history information Rejected caller information automatic deletion means for specifying and deleting rejected caller information to be automatically deleted from the rejected caller information storage means based on the communication history information stored in the storage means, To do.

  Further, the invention according to claim 7 is the above invention, wherein the communication history information storage means stores the last message communication time as communication history information, and the rejected caller information automatic deletion means is the communication history information storage means. When the difference between the last message communication time stored in the current time and the current time is larger than a predetermined value, the rejected caller information corresponding to the user and the communication partner is automatically deleted from the rejected caller information storage means. It is characterized by that.

  In the invention according to claim 8, in the above invention, the communication history information storage means stores the last message communication time as communication history information, and the rejected caller information automatic deletion means stores the rejected caller information storage. When the number of rejected caller information stored in the rejected caller information storage means for the user when registering new rejected caller information corresponding to the user in the means is a predetermined maximum value, Of the rejected caller information stored for the user, the rejected caller information relating to the communication partner with the oldest last message communication time stored in the communication history storage means is deleted.

  The invention according to claim 9 is a message delivery system for delivering a message based on sender information that is information about a sender of the message, and is a permission that is information about each sender that the user permits to receive. Allowed caller information storage means storing caller information for one or more callers for each user, and one or more rejected caller information for each user for each caller that the user refuses to receive When registering the rejected caller information storage means stored for the caller and the new rejected caller information storage means, information that matches the new rejected caller information is the permitted caller information. And a rejected sender information registration executing means for deleting the matching information from the permitted sender information storing means when stored in the storage means.

  Further, the invention according to claim 10 is the above invention, wherein each permitted sender information corresponding to the destination of the arrived message is read from the permitted sender information storage means and compared with the sender information of the message. A transfer permission determination unit that determines that the message can be transferred when there is permitted sender information to be transmitted, and determines whether the message can be transferred when the transfer permission determination unit does not determine that the message can be transferred And a transfer permission / inhibition determining means.

  The invention according to claim 11 is the above invention, wherein each rejected sender information corresponding to the destination of the arrived message is read from the rejected sender information storage means and compared with the sender information of the message. A transfer rejection determination unit that determines that the transfer of the message is impossible when there is rejected caller information, and determines whether the message can be transferred when the transfer rejection determination unit does not determine that the transfer of the message is impossible And a transfer permission / inhibition determining means.

  The invention according to claim 12 is a message transfer device for transferring a message based on caller information, which is information relating to the caller of the message, when the user sends a message to a new communication partner. It is characterized by comprising an authorized sender information automatic registration means for automatically registering information on a communication partner as authorized sender information on a sender that the user permits to receive.

  According to a thirteenth aspect of the present invention, there is provided a message transfer device for transferring a message on the basis of caller information that is information relating to a message caller, based on communication history information of each user with each communication partner. , For each caller the user is permitted to receive, there is provided a permitted caller information automatic deletion means for identifying and deleting the permitted caller information to be automatically deleted from the information registered as permitted caller information. Features.

  Further, the invention according to claim 14 is the above invention, wherein the communication history information is a final message communication time point, and the permitted caller information automatic deletion means includes a final message communication time point with each communication partner of each user; When the difference is larger than a predetermined value compared with the current time point, the permitted sender information corresponding to the communication partner is automatically deleted from the permitted sender information of the user.

  The invention according to claim 15 is the above invention, wherein the communication history information is at the time of the last message communication, and the permitted caller information automatic deletion means registers the permitted caller information newly corresponding to the user. When the number of permitted caller information already registered for the user is a predetermined maximum value, the last message communication time of the permitted caller information already registered for the user is The permitted sender information on the oldest communication partner is deleted.

  The invention according to claim 16 is a message transfer device for transferring a message on the basis of caller information that is information relating to the sender of the message, and is a permission that is information relating to each caller permitted to be received by the user. When newly registering caller information corresponding to a user, information that matches the new permitted caller information is registered as rejected caller information that is information about each caller that the user refuses to receive. In the case where the caller information is registered, a permitted caller information registration executing means for deleting the matching rejected caller information is provided.

  The invention according to claim 17 is a message transfer device for transferring a message on the basis of caller information that is information relating to the caller of the message, on the basis of communication history information with each communication partner of each user. , For each caller whose reception is refused to be received, there is provided a rejected caller information automatic deletion means for specifying and deleting rejected caller information to be automatically deleted from information registered as rejected caller information. Features.

  The invention according to claim 18 is the above invention, wherein the communication history information is a final message communication time point, and the rejected caller information automatic deletion means includes a final message reception time point from each caller of each user, and When the difference is larger than a predetermined value compared with the current time point, the rejected sender information corresponding to the sender is automatically deleted from the rejected sender information of the user.

  The invention according to claim 19 is the above invention, wherein the communication history information is at the time of last message communication, and the rejected caller information automatic deletion means registers the rejected caller information newly corresponding to the user. When the number of rejected caller information already registered for the user is a predetermined maximum value, the last message reception time of the rejected caller information already registered for the user is The rejected caller information relating to the oldest caller is deleted and new rejected caller information is registered.

  The invention according to claim 20 is a message transfer device that forwards a message based on caller information that is information relating to the sender of the message, and is a rejection that is information relating to each caller that the user refuses to receive. When newly registering caller information corresponding to a user, information that matches the new rejected caller information is registered as permitted caller information that is information about each caller that the user permits to receive. If there is, the apparatus is characterized by comprising rejected caller information registration executing means for deleting the matched permitted caller information.

  The invention according to claim 21 is a message transfer method by a message transfer device for transferring a message based on caller information which is information relating to the sender of the message, wherein the user transmits a message to a new communication partner. In this case, the information processing apparatus includes a permitted caller information automatic registration step of automatically registering information on the communication partner as permitted caller information on a caller whose reception is permitted by the user.

  According to a twenty-second aspect of the present invention, there is provided a message transfer method by a message transfer apparatus for transferring a message based on caller information which is information relating to a message sender, and a communication history of each user with each communication partner. Based on the information, an authorized caller information automatic deletion process for identifying and deleting the permitted caller information to be automatically deleted from the information registered as permitted caller information for each caller that the user permits to receive. It is characterized by including.

  The invention according to claim 23 is the above invention, wherein the communication history information is a final message communication time, and the permitted caller information automatic deletion step includes a final message reception time from each caller of each user, and When the difference is larger than a predetermined value compared with the current time point, the permitted sender information corresponding to the sender is automatically deleted from the permitted sender information of the user.

  According to a twenty-fourth aspect of the present invention, in the above invention, the communication history information is at the time of the last message communication, and the authorized sender information automatic deletion step registers the authorized sender information in association with a new user. When the number of permitted caller information already registered for the user is a predetermined maximum value, the last message reception time of the permitted caller information already registered for the user is The permitted sender information on the oldest sender is deleted and new permitted sender information is registered.

  The invention according to claim 25 relates to a message transfer method by a message transfer device for transferring a message based on caller information which is information relating to a caller of the message, and relates to each caller permitted to receive by the user. When the authorized sender information, which is information, is newly registered to correspond to the user, the information that matches the new authorized sender information is information regarding each sender that the user refuses to receive. When it is registered as information, it includes a permitted sender information registration execution step of deleting the matching rejected sender information.

The invention according to claim 26 is a message transfer method by a message transfer device for transferring a message based on caller information which is information relating to the caller of the message,
Based on the communication history information with each communication partner of each user, the rejected caller information to be automatically deleted from the information registered as rejected caller information for each caller that the user refuses to receive is specified. The rejected caller information automatic deletion step of deleting is included.

  According to a twenty-seventh aspect of the present invention, in the above invention, the communication history information is a final message communication time, and the rejected caller information automatic deletion step includes a final message reception time from each sender of each user, and When the difference is larger than a predetermined value compared with the current time point, the rejected sender information corresponding to the sender is automatically deleted from the rejected sender information of the user.

  The invention according to claim 28 is the above invention, wherein the communication history information is at the time of the last message communication, and the rejected caller information automatic deletion step registers the rejected caller information in association with a new user. When the number of rejected caller information already registered for the user is a predetermined maximum value, the last message reception time of the rejected caller information already registered for the user is The rejected caller information relating to the oldest caller is deleted and new rejected caller information is registered.

  The invention according to claim 29 is a message transfer method by a message transfer device for transferring a message based on caller information which is information relating to the caller of the message, and relates to each caller that the user refuses to receive. When newly registering rejected caller information, which is information, corresponding to the user, information that matches the new rejected caller information is information regarding each sender that the user permits to receive. When registered as information, it includes a rejected caller information registration execution step of deleting the matching permitted caller information.

  An invention according to claim 30 is a message transfer program that causes a computer to execute the message transfer method according to any one of claims 21 to 29.

  According to the invention of claim 1, 12 or 21, when a user transmits a message to a new communication partner, information regarding the communication partner is automatically registered as permitted caller information regarding a caller whose reception is permitted by the user. Since it comprised so, the burden that a user registers the information regarding a new communication other party as permission sender | caller information can be reduced.

  According to the invention of claim 2, 13 or 22, each user is registered as permitted caller information for each caller permitted to receive based on communication history information with each communication partner. Since the permitted sender information that is automatically deleted from the existing information is specified and deleted, the storage device that stores the permitted sender information can be used efficiently.

  According to the invention of claim 3, 14 or 23, when the difference between the last message communication time with each communication partner of each user and the current time is greater than a predetermined value, the user Since the authorized sender information corresponding to the communication partner is automatically deleted from the information registered as the authorized sender information for each authorized sender, the authorized sender information that is no longer needed is registered. Therefore, it is possible to efficiently use the storage device that stores the permitted sender information.

  According to the invention of claim 4, 15 or 24, when newly registering authorized caller information corresponding to the user, the number of permitted caller information already registered for the user is a predetermined maximum. If it is a value, the authorized sender information related to the communication partner whose oldest message communication time is the oldest among the authorized sender information already registered for the user is deleted and new authorized sender information is registered. Since it comprised, the area | region required in order to memorize | store permission sender | caller information can be restrained within a fixed amount.

  According to the invention of claim 5, 16 or 25, when newly registering permitted sender information corresponding to a user, information matching the new permitted sender information is registered as rejected sender information. In this case, since the matching rejected caller information is deleted, the consistency of the registered information can be ensured and annoying messages can be accurately eliminated.

  According to the invention of claim 6, 17 or 26, each caller that the user refuses to receive is registered as rejected caller information based on the communication history information of each user with each communication partner. Since the rejected caller information to be automatically deleted is specified and deleted from the stored information, the storage device for storing the rejected caller information can be used efficiently.

  According to the invention of claim 7, 18 or 27, when the difference between the last message reception time from each sender of each user and the current time is greater than a predetermined value, Because it is configured to automatically delete rejected caller information corresponding to the caller from the information registered as rejected caller information for each caller who refuses to receive, rejected caller information that is no longer needed is registered Therefore, it is possible to efficiently use the storage device that stores the rejected caller information.

  According to the invention of claim 8, 19 or 28, when newly registering rejected caller information corresponding to the user, the number of rejected caller information already registered for the user is a predetermined maximum. If the value is a value, among the rejected caller information already registered for the user, the rejected caller information related to the caller with the oldest message reception time is deleted and new rejected caller information is registered. Since it comprised, the area | region required in order to memorize | store rejection caller information can be restrained within a fixed value.

  According to the invention of claim 9, 20 or 29, when newly registering rejected caller information corresponding to the user, information matching the new rejected caller information is registered as permitted sender information. In this case, since the matching permitted sender information is deleted, the consistency of the registered information can be ensured, and the nuisance message can be accurately eliminated.

  According to the invention of claim 10, each permitted sender information corresponding to the destination of the arrived message is read out and compared with the sender information of the message. When there is a matching permitted sender information, the message is transferred. Since it is determined that the message can be transferred when it is determined that the message is not transferred, the information registration about the sender that permits the reception such as automatic deletion of the permitted caller information is performed. Even if there is no message, the message can be transferred.

  According to the invention of claim 11, each rejected caller information corresponding to the destination of the arrived message is read and compared with the message sender information, and if there is matching rejected caller information, the message is transferred. Since it is determined that the message cannot be transferred when it is determined that the message cannot be transferred, it is determined whether or not the message can be transferred. Even when there is no message, the message transfer can be prevented.

  Exemplary embodiments of a message delivery system, a message transfer apparatus, a message transfer method, and a message transfer program according to the present invention will be described below in detail with reference to the accompanying drawings. Here, the case where the present invention is applied to a mail delivery system will be mainly described.

  In the first embodiment, after describing the configuration of the mail delivery system according to the first embodiment, processing procedures such as mail transfer processing of the mail delivery system and registration deletion processing of various data used for mail filtering will be described. The effect of Example 1 is demonstrated.

[Configuration of mail delivery system (Example 1)]
First, the configuration of the mail delivery system according to the first embodiment will be described with reference to FIG. FIG. 1 is a diagram illustrating the configuration of the mail delivery system according to the first embodiment. The mail delivery system shown in the figure connects a service user A terminal 220 and a communication partner B terminal 320 via a service user A side IP network 240, the Internet 400, and a communication partner B side IP network 340. A service user A terminal 220 sends a mail addressed to the service user A 230 sent from the communication partner B terminal 320 to the communication partner B 330 via the communication partner B mail server 310 and the service user A mail server 210. This is a mail delivery system that delivers up to Here, it is assumed that the service user A230 is a user of the mail delivery service according to the first embodiment, and the communication partner B330 is a partner who exchanges mail with the service user A230.

  The service user A terminal 220 and the communication partner B terminal 320 are terminal devices that are used when the service user A 230 and the communication partner B 330 exchange mails via the Internet 400, respectively. WEB browser software and electronic mail software (mailer) are installed in the PC), and are connected to the service user A side IP network 240 and the communication partner B side IP network 340 via the router R, respectively. The service user A side IP network 240 and the communication partner B side IP network 340 are each connected to the Internet 400 via a router R.

  The service user A mail server 210 and the communication partner B mail server 310 are so-called existing mail servers. That is, the service user A mail server 210 accepts the mail transmitted from the service user A terminal 220 and transmits it to the mail destination, and receives the mail to the service user A terminal 220 to receive the service user A terminal 220. The communication partner B mail server 310 receives the mail transmitted from the communication partner B terminal 320 and transmits it to the destination of the mail, and receives the mail to the communication partner B terminal 320 to receive the communication partner B. Transmit to terminal 320. For convenience of explanation, only two terminal devices and a mail server are shown here, but this mail delivery system is composed of a large number of terminal devices and mail servers.

  In addition, in this mail delivery system, in addition to an email addressed to an actual email address held by a user (hereinafter referred to as “real address”), a public address composed of a user ID and a predetermined domain name is sent to Deliver the email. FIG. 2 is a diagram illustrating an example of a public address. As shown in the figure, this public address is composed of a user ID “suzuki” and a domain name “privango.net” of the mail transfer server 110 described later.

  The reason for using the public address is that the user may not want to disclose the real address to the communication partner. For example, if the communication partner is a mail order dealer on the Internet, if you disclose the real address unnecessarily, this real address will spread to other vendors through mailing lists, etc., and direct mail etc. that do not require users This is because there may be a situation where it is necessary to receive a call.

  As described above, in this mail delivery system, since a public address can be used, a mail transfer server 110 that receives a mail addressed to the public address and forwards it to a recipient, whitelist and blacklist registration processing, and the like A white list / black list registration server 120 for performing the above, a data management server 130 for managing a white list, a black list, and the like, and an individual address issuing server 140 for issuing an individual address.

  Here, the white list is a list of sender mail addresses (hereinafter referred to as “reception permitted addresses”) and domain names (hereinafter referred to as “reception permitted domain names”) that the user allows to receive mail. Is a list of mail addresses (hereinafter referred to as “reception refusal addresses”) and domain names (hereinafter referred to as “reception refusal domain names”) of senders who refuse to receive mail. The mail transfer server 110 determines whether mail can be transferred using a white list and a black list when a mail addressed to a public address is transferred.

  In other words, the mail transfer server 110 determines that the mail can be transferred when the mail address of the sender is registered in the white list corresponding to the mail destination, and the mail address of the sender is the mail destination. If it is registered in the black list corresponding to, it is determined that mail transfer is impossible. The mail transfer server 110 requests the individual address issuing server 140 to generate an individual address when the sender's mail address is not registered in either the white list or the black list corresponding to the mail destination. The mail sender is requested to resend the individual address generated by the individual address issuing server 140 as the destination.

  Here, the individual address is a conditional address in which mail transfer conditions such as a period (time limit), time, and sender address where mail transfer is permitted are incorporated, and the mail transfer server 110 receives the individual address as a destination. When the e-mail is received, the transfer condition is taken out, and the e-mail is transferred to the recipient when the transfer condition is satisfied.

  FIG. 3 is a diagram illustrating an example of an individual address. As shown in the figure, this individual address includes a user ID “suzuki”, a mail transfer condition “sbtwr3”, a falsification prevention code “gr5b”, and a domain name “privango.net” of the mail transfer server 110. Details of the processing related to the individual address will be described later.

  As described above, the mail delivery system according to the first embodiment filters the mail using the white list and the black list, and for the mail of the caller who is not registered in either the white list or the black list, By filtering mail using individual addresses, filtering using both a white list and a black list is possible.

  In other words, conventionally, since it is possible to determine whether or not mail can be transferred only by using either the white list or the black list, the white list and the black list are not used together. However, the white list alone has a problem that the burden of registering all permitted recipients is large, and the black list alone has a problem that it is not possible to deal with junk mail that constantly changes the source address. Therefore, the mail delivery system according to the first embodiment can use both advantages by using both the white list and the black list. That is, information on a reliable communication partner is registered in the white list, and information on a sender who wants to reject an incoming call is registered in the black list. Then, mails from senders not registered in either list are filtered using individual addresses.

  In this way, by performing filtering that combines the white list, black list, and individual address, it is possible to realize a spam mail rejection system that has both the convenience of the white list and the black list and the completeness of the individual address. Can do.

  The mail transfer server 110, the whitelist / blacklist registration server 120, the data management server 130, and the individual address issuing server 140 are connected to the LAN 100 connected to the Internet 400 via the router R and the firewall FW.

  The mail transfer server 110 is a server device that performs filtering processing and forwarding processing of mail whose destination is a public address, and includes a mail communication unit 111, a filter processing unit 112, a transfer processing unit 113, and a white list automatic processing unit. 114 and a black list automatic processing unit 115. Such a mail transfer server 110 can be realized by installing a program corresponding to these functional units in a commercially available PC or workstation (WS).

  The mail communication unit 111 is a processing unit that receives a mail whose destination is a public address or an individual address from a mail server on the transmission side, and transmits the filtered mail to the mail server on the reception side.

  The filter processing unit 112 is a processing unit that performs filtering of mail whose destination is a public address. Specifically, when the mail source address is registered in the white list, the mail is transferred to the transfer processing unit 113. If the sender address of the mail is registered in the black list, the mail is discarded.

  Further, when the mail transmission source address is not registered in the white list or the black list, the filter processing unit 112 requests the individual address issuing server 140 to issue an individual address, and issues the issued individual address. To the caller and request to resend the mail. Then, the transfer condition of the retransmitted mail is determined. If the transfer condition is satisfied, it is determined that the mail can be transferred. If the transfer condition is not satisfied, the mail is discarded.

  As described above, the filter processing unit 112 determines whether mail can be transferred using the white list and the black list, and when the transmission source address is not registered in the white list or the black list, the individual address By determining whether or not mail can be transferred using, it is possible to use both a white list and a black list and to reliably eliminate junk mail. The details of the filter processing by the filter processing unit 112 will be described later.

  The transfer processing unit 113 is a processing unit that changes the address of the mail determined to be transferable by the filter processing unit 112 to a real address and transfers it. Specifically, the transfer processing unit 113 transfers the mail by changing the destination to the real address corresponding to the user ID.

  The white list automatic processing unit 114 is a processing unit that performs automatic registration in the white list, and the black list automatic processing unit 115 is a processing unit that performs automatic registration and automatic deletion in the black list.

  The white list automatic processing unit 114 and the black list automatic processing unit 115 perform automatic registration and automatic deletion to the white list and black list, respectively, thereby reducing the burden of managing the white list and black list by the user. Can do. Details of the processes of the white list automatic processing unit 114 and the black list automatic processing unit 115 will be described later. The white list, black list, and real address are managed by the data management server 130.

  The whitelist / blacklist registration server 120 is a server device that performs a process of registering a reception permission address, a reception rejection address, and the like in the data management server 130. The whitelist / blacklist registration server 120 includes a HTTP communication unit 121, a whitelist registration processing unit 122, A list registration processing unit 123. The whitelist / blacklist registration server 120 can be realized by installing programs corresponding to these functional units in a commercially available PC or WS, as with the mail transfer server 110.

  The HTTP communication unit 121 is a processing unit that performs communication according to HTTP (Hyper Text Transfer Protocol). For example, the HTTP communication unit 121 receives a registration request of a mail address to a white list or a black list performed by a user using WEB browser software. Then, the data is transferred to the white list registration processing unit 122 or the black list registration processing unit 123.

  The white list registration processing unit 122 receives a registration request such as a reception permission address to the white list or a registration request from the white list automatic processing unit 114 which is performed by a user using WEB browser software, and is managed by the data management server 130. A processing unit that performs registration in the white list. Specifically, the processing unit accepts a user ID, a reception permission address, and the like, and requests the data management server 130 to register.

  The black list registration processing unit 123 receives a registration request such as a reception rejection address to the black list or the registration request and the deletion request from the black list automatic processing unit 115 performed by the user using the WEB browser software, and the data management server 130. Is a processing unit that performs registration and deletion in the black list managed by the user, specifically, accepts a user ID, a reception rejection address, and the like, and requests the data management server 130 for registration and deletion.

  The data management server 130 is a server device that manages a white list, a black list, and a real address, and includes a real address table 131, a white list table 132, and a black list table 133. Similar to the mail transfer server 110 and the white list / black list registration server 120, the data management server 130 can be realized by installing a program for managing data in a commercially available PC or WS.

  The real address table 131 is a table that stores user IDs and real addresses in association with each other. FIG. 4 is a diagram illustrating an example of the real address table 131. As shown in the figure, the real address table 131 stores the real address “suzuki1010@anywhere.ne.jp” corresponding to the user ID “suzuki” and the real address “sunaka” corresponding to the user ID “tanaka”. “taro@isp-A.ne.jp” is stored, and the real address “yamada-k@anywhere.ne.jp” is stored in association with the user ID “yamada”.

  The white list table 132 is a table that stores a user ID and a white list in association with each other. FIG. 5 is a diagram illustrating an example of the white list table 132. As shown in the figure, the white list table 132 includes a reception permission address “taro@isp-A.ne.jp” and a reception permission domain name “anywhere.ne.jp” corresponding to the user ID “suzuki”. Memorize and store the reception permitted address “suzuki1010@anywhere.ne.jp” and the reception permitted domain name “isp-A.ne.jp” corresponding to the user ID “tanaka” and correspond to the user ID “yamada”. The reception permitted domain name “anywhere.ne.jp” is stored.

  The black list table 133 is a table that stores a user ID and a black list in association with each other. FIG. 6 is a diagram illustrating an example of the black list table 133. As shown in the figure, this black list table 133 stores a reception rejection address “spammer@black.com” in association with the user ID “suzuki”, and a reception rejection address “spammer@black.com” in association with the user ID “tanaka”. “advertise@shop.com” and “spam@mail.com” are stored, and the reception rejection address “black@spam.com” is stored in association with the user ID “yamada”.

  The individual address issuing server 140 is a server device that issues an individual address, and includes a communication unit 141 and an address generation unit 142. The individual address issuing server 140 can be realized by installing a program for managing data in a commercially available PC or WS like the mail transfer server 110 or the like.

  The communication unit 141 is a processing unit that communicates with the mail transfer server 110 or the like via the LAN 100. For example, the communication unit 141 receives an individual address generation request from the mail transfer server 110 and transmits the individual address to the mail transfer server 110.

  The address generation unit 142 is a processing unit that receives an individual address generation request from the communication unit 141, generates an individual address, and passes it to the communication unit 141. The details of the individual address generation process by the address generation unit 142 will be described later.

  Next, a processing procedure by the mail delivery system according to the first embodiment will be described with reference to FIGS. In the following description, a case where the communication partner B330 transmits a mail to the service user A230 will be described as an example. Further, as shown in FIG. 7, the service user A230 can publish the public address “suzuki@privango.net” in advance on the homepage, and the communication partner B330 can use the public address of the service user A230. Shall.

[Mail transfer processing (Example 1)]
FIG. 8 is a sequence diagram illustrating a processing procedure of mail transfer processing by the mail delivery system according to the first embodiment. As shown in the figure, in this mail transfer process, the communication partner B terminal 320 receives a mail transmission request addressed to the public address “suzuki@privango.net” from the communication partner B 330 and sends it to the communication partner B mail server 310. Transmit (step S110). Then, the communication partner B mail server 310 transmits the mail to the mail transfer server 110 because the transmission destination is the public address “suzuki@privango.net” (step S120).

  Then, the filter processing unit 112 of the mail transfer server 110 that has received the mail refers to the white list table 132 and the black list table 133 to perform filter processing, that is, whether to transfer mail (step S130). As a result, when the filter processing unit 112 determines that transfer is possible, the process shown in FIG. 9 is performed. When it is determined that transfer is not possible, the mail is discarded. When transferability is unknown, the process shown in FIG.

  That is, when the filter processing unit 112 determines that transfer is possible, the transfer processing unit 113 obtains a real address from the real address table 131 (step S140) and transmits a mail using the real address as the transfer destination, as shown in FIG. (Step S150). Then, the mail received by the service user A mail server 210 is temporarily stored.

  Thereafter, when the service user A terminal 220 requests the service user A mail server 210 to confirm the arrival mail based on an instruction from the service user A 230 (step S160), the service user A mail server 210 temporarily stores the mail. Is transmitted to the service user A terminal 220 (step S170).

  If the filter processing unit 112 determines that transfer is not possible, the filter processing unit 112 requests the address generation unit 142 of the individual address issuing server 140 to generate an individual address as shown in FIG. 10 (step S180). It responds to the communication partner B terminal 320 (step S190) and requests retransmission of the mail.

  Then, upon receiving the individual address, the communication partner B terminal 320 stores the individual address in the address book of the mail software based on the instruction of the communication partner B 330 (step S200), and retransmits the mail with the individual address as the destination. (Step S210). Then, the filter processing unit 112 of the mail transfer server 110 performs a filtering process based on the transfer condition of the individual address, that is, a delivery determination process for determining whether delivery is possible (step S220). If the transfer condition is satisfied, A delivery process for delivering the mail is performed (step S230). Details of the delivery determination process and the delivery process will be described later.

  As described above, the filter processing unit 112 of the mail transfer server 110 refers to the white list table 132 and the black list table 133 to determine whether or not the mail addressed to the public address can be transferred. Since mail filtering is performed based on individual addresses, users can use services that have both the simplicity provided by the whitelist and blacklist and the certainty provided by individual addresses when eliminating junk mail. can do.

[Filter processing (Example 1)]
Next, the process procedure of the filter process (process corresponding to step S130 shown in FIG. 8) by the filter processing unit 112 will be described. FIG. 11 is a flowchart showing the processing procedure of the filter processing by the filter processing unit 112. Here, a case where the destination address is “suzuki@privango.net” will be described as an example.

  As shown in the figure, in this filter processing, the filter processing unit 112 receives the transmission source address and the destination address, and acquires the user ID u from the destination address (step S131). Here, “suzuki” is acquired as u. Then, the filter processing unit 112 acquires the white list WL corresponding to the user ID u from the white list table 132 (step S132). Here, it is assumed that the white list WL corresponding to “suzuki” = {taro @ isp-A.ne.jp, anywhere.ne.jp}.

  Then, the filter processing unit 112 sets the element in the white list WL as w, and determines whether there is w that matches the source address or partially matches the domain part of the source address (step S133). As a result, when such w is in the white list, the filter processing unit 112 determines that the mail can be transferred (step S136a).

  On the other hand, when such w is not in the white list, the filter processing unit 112 acquires the black list BL corresponding to the user ID u from the black list table 133 (step S134). Here, it is assumed that the black list BL corresponding to “suzuki” = {spammer@black.com}.

  Then, the filter processing unit 112 sets the element in the black list BL to b, and determines whether there is b that matches the source address or partially matches the domain part of the source address (step S135). As a result, if such b is in the black list, the filter processing unit 112 determines that the mail cannot be transferred (step S136b), and if not, determines that the transfer is unknown. (Step S136c).

  In this way, the filter processing unit 112 determines whether mail can be transferred based on whether the white list or the black list includes an element that matches the source address or partially matches the domain part of the source address. When there is no such element in either the list or the black list, it is possible to use both the white list and the black list by determining that transfer is not possible.

  In this example, if the source address is “taro@isp-A.ne.jp” or the domain part of the source address partially matches “anywhere.ne.jp”, it is determined that transfer is possible. When the source address is “spammer@black.com”, it is determined that transfer is not possible, and in other cases, it is determined that transfer is not possible.

  In this filter processing, the filter processing unit 112 checks whether there is an element in the white list that matches the source address or partially matches the domain part of the source address. Although we decided to check the list, it is also possible to check the white list after checking the black list.

[Address Generation Processing (Example 1)]
Next, a processing procedure of address generation processing by the address generation unit 142 of the individual address issuing server 140 will be described. FIG. 12 is a sequence diagram illustrating a processing procedure of address generation processing by the address generation unit 142. Here, a case where the caller is limited as a transfer condition will be described as an example.

  As shown in the figure, the address generation unit 142 inputs the user ID u of the service user A and the mail address S of the communication partner B, and generates the transfer condition C related to the caller limitation (step S181). Specifically, after the hash value of the mail address S is obtained, the lower 30 bits of this hash value are encoded with BASE32 to generate a 6-character string V_S (for example, “sbtwr3”).

  Subsequently, the address generation unit 142 generates a tampering prevention code for ensuring the validity of the individual address T (step S182). Specifically, a character string K is generated by concatenating the user ID u (for example, “suzuki”) and the six character string V_S (for example, “sbtwr3”) generated in step S181 above with the dot character “.”. Later, the keyed hash function value of the character string K is obtained using the issued key, and the lower 20 bits of this value are encoded with BASE32 to generate a four-character tamper-proof code V (for example, “gr5b”). To do.

  Then, the address generation unit 142 generates the individual address T using the character string K and the falsification prevention code V (step S183). Specifically, a character string in which a character string K (for example, “suzuki.sbtwr3”) and a falsification prevention code V (for example, “gr5b”) are concatenated is generated, and the domain name “@ privango.net” is added after the character string. Is added to generate and output the individual address T.

  As described above, the address generation unit 142 generates the transfer condition and the falsification prevention code to generate the individual address, so that the transfer condition can be incorporated into the mail address and the individual address can be prevented from being falsified.

[Delivery determination processing (Example 1)]
Next, details of mail delivery determination processing (processing corresponding to step S220 shown in FIG. 10) by the filter processing unit 112 of the mail transfer server 110 will be described with reference to FIG. FIG. 13 is a flowchart showing details of mail delivery determination processing by the filter processing unit 112. Here, a case where the caller is limited as a transfer condition will be described as an example.

  As shown in FIG. 13, in this delivery determination process, the filter processing unit 112 receives the individual address T and the mail address S of the communication partner B as input, and verifies the validity of the individual address T (falsification prevention code) (step). S221).

  Specifically, the filter processing unit 112 acquires the first half of the user name portion of the incoming mail destination address (that is, the individual address T) from the end to the fifth character as a character string K, and four characters from the end. The second half after the first is acquired as a character string V. Then, the filter processing unit 112 obtains the value of the keyed hash function of the character string K using the verification key, encodes the lower 20 bits of this value with BASE32, obtains the character string T of 4 characters, and obtains the character string V And whether or not the character string T matches. If the two match in this determination, it is determined that the falsification prevention code is valid, and the process proceeds to the following step S222. If the two do not match, the individual address T is determined to be invalid. Is sent to the communication partner B terminal 320, and the delivery determination process is terminated.

  Following such verification of the falsification prevention code, the filter processing unit 112 verifies whether or not it is a legitimate caller (step S222). Specifically, the same algorithm as in the case of generating the individual address T using the hash value of the sender address of the incoming mail (that is, the mail address S of the communication partner) (the algorithm executed in step S181 in FIG. 12 described above) Then, the lower 30 bits of this hash value are encoded with BASE32 to generate a 6-character string T_S. Then, the filter processing unit 112 acquires a portion after the dot character “.” In the character string K acquired in step S221 as the character string V_S, and whether or not the character string V_S matches the character string T_S. Determine whether. If both match in this determination, it is determined that the caller is valid, and the process proceeds to the process of step S223 shown below. However, if both do not match, it is described that the caller is incorrect. The response mail (delivery impossible mail) is transmitted to the communication partner B terminal 320, and the delivery determination process is terminated.

  As a result, when both of the delivery determinations (steps S221 and S222) described above are satisfied, the filter processing unit 112 performs a character string (for example, “ suzuki ") is extracted as the user ID u (step S223), the user ID u and the delivery determination result are output, and the delivery determination process is terminated.

  As described above, the filter processing unit 112 verifies the falsification prevention code and the caller, and determines whether or not delivery is possible based on the verification result, thereby preventing unauthorized mail transfer.

[Whitelist Manual Registration Processing (Example 1)]
Next, a processing procedure of registration processing of a reception permitted address and a reception permitted domain name to the white list by the mail delivery system according to the first embodiment will be described. FIG. 14 is a sequence diagram illustrating a processing procedure for registering a reception-permitted address and a reception-permitted domain name in the white list by the mail delivery system according to the first embodiment. Here, a case where the service user A230 registers the reception permitted address in the white list will be described.

  As shown in the figure, in this whitelist registration process, the service user A terminal 220 receives an input of a registration address (reception permission address) to be registered in the whitelist from the service user A230 (step S310), and the user A permission address registration request is made to the whitelist / blacklist registration server 120 together with the ID and the registration address (step S320). For example, the service user A terminal 220 makes a permission address registration request to the whitelist / blacklist registration server 120 together with the user ID “suzuki” and the registration address “taro@isp-A.ne.jp”.

  Then, the whitelist registration processing unit 122 of the whitelist / blacklist registration server 120 receives the user ID and the registration address, and requests the data management server 130 to register the registration address in the whitelist corresponding to the user ID. The white list registration process is performed (step S330). When the registration in the white list table 132 is completed, the white list registration processing unit 122 transmits a white list registration response to the service user A terminal 220 (step S340).

  In this way, the whitelist registration processing unit 122 of the whitelist / blacklist registration server 120 requests the data management server 130 to register in the whitelist based on the request of the service user A230, thereby allowing the reception permission address. And the reception-permitted domain name can be registered in the white list table 132.

[Black List Manual Registration Process (Example 1)]
Next, a processing procedure of registration processing of a reception refusal address or reception refusal domain name to the black list by the mail delivery system according to the first embodiment will be described. FIG. 15 is a sequence diagram illustrating a processing procedure of registration processing of a reception refusal address and a reception refusal domain name to the black list by the mail delivery system according to the first embodiment. Here, the case where the service user A230 registers the reception refusal address in the black list will be described.

  As shown in the figure, in the blacklist registration process, the service user A terminal 220 accepts an input of a registration address (reception refusal address) registered in the blacklist from the service user A230 (step S410), and the user A rejection address registration request is made to the whitelist / blacklist registration server 120 together with the ID and registration address (step S420). For example, the service user A terminal 220 makes a rejection address registration request to the whitelist / blacklist registration server 120 together with the user ID “suzuki” and the registration address “spammer@black.com”.

  Then, the blacklist registration processing unit 123 of the whitelist / blacklist registration server 120 receives the user ID and the registration address, and requests the data management server 130 to register the registration address in the blacklist corresponding to the user ID. A blacklist registration process is performed (step S430). When the registration in the black list table 133 is completed, the black list registration processing unit 123 transmits a black list registration response to the service user A terminal 220 (step S440).

  In this way, the blacklist registration processing unit 123 of the whitelist / blacklist registration server 120 requests the data management server 130 to register to the blacklist based on the request of the service user A230, thereby receiving the reception rejection address. And the reception refusal domain name can be registered in the black list table 133.

  14 and 15, the case where the service user A 230 makes a registration request to the white list and black list from the service user A terminal 220 has been described. However, registration and deletion to the white list and black list are automatically performed. Can also be done. Accordingly, processing for automatic registration to the white list and automatic registration / deletion to the black list will be described.

[White List Automatic Registration Processing (Example 1)]
FIG. 16 is a sequence diagram illustrating a processing procedure in which the mail delivery system according to the first embodiment automatically registers the destination address in the white list when the service user A230 transmits a mail to the new communication partner B330. Here, it is assumed that all mails transmitted by the service user A230 are transferred to the mail transfer server 110. In addition, when the service user A230 sends a mail, it is considered that the service user A230 receives a mail from the communication partner B330. Therefore, the destination address of the communication partner B330 is automatically registered in the white list.

  As shown in FIG. 16, in this white list automatic registration process, the service user A terminal 220 transmits a mail to a new communication partner based on an instruction from the service user A 230 (step S510).

  Then, the whitelist automatic processing unit 114 of the mail transfer server 110 registers the destination address in the whitelist corresponding to the user ID of the service user A230, and the whitelist registration processing unit 122 of the whitelist / blacklist registration server 120. (Step S520). For example, it requests registration of “taro@isp-A.ne.jp” to the white list corresponding to the user ID “suzuki”.

  When registration in the white list table 132 is completed, the white list automatic processing unit 114 transmits a mail to the communication partner B mail server 310 (step S530), and temporarily stores the mail received by the communication partner B mail server 310. To do.

  Thereafter, when the communication partner B terminal 320 requests the communication partner B mail server 310 to confirm the arrival mail based on the instruction of the communication partner B 330 (step S540), the communication partner B mail server 310 transmits the temporarily stored mail to the communication partner B. It transmits to the terminal 320 (step S550).

  As described above, when the white list automatic processing unit 114 automatically transmits a destination address to the white list when the service user A230 transmits a mail to a new communication partner, a mail address or the like that the user permits to receive is registered. Can be reduced the burden of whitelisting.

  In addition, the communication partner B330 that is not registered in either the white list or the black list transmits a mail, and the mail transfer server 110 requests that the mail be resent with the individual address as a destination, and the individual address in response to the request. The mail address of the communication partner B330 can be automatically registered in the white list when the retransmitted mail satisfies the transfer condition. In other words, when the mail addressed to the individual address satisfies the transfer condition, it is considered that the communication partner B330 can be trusted, so the mail address of the communication partner B330 can be registered in the white list.

  Therefore, a processing procedure for automatically registering the sender address in the white list when the mail addressed to the individual address satisfies the transfer condition will be described. FIG. 17 is a sequence diagram illustrating a processing procedure in which a mail delivery system according to the first embodiment automatically registers a sender address in a white list when a mail addressed to an individual address satisfies a transfer condition.

  As shown in FIG. 17, in the automatic registration process to the white list, when the communication partner B 330 transmits a mail from the communication partner B terminal 320 in response to a mail resend request destined for the individual address (step S610), communication is performed. The partner B mail server 310 receives the mail and transmits it to the mail transfer server 110 (step S620). For example, the individual address “suzuki.sbtwr3gr5b@privango.net” is used as the destination address.

  Then, when the filter processing unit 112 of the mail transfer server 110 performs the delivery determination process shown in FIG. 13 (step S630) and determines that delivery is possible, the sender address to the white list corresponding to the user ID included in the individual address The white list automatic processing unit 114 requests the white list registration processing unit 122 of the white list / black list registration server 120 (step S640). For example, the sender address “taro@isp-A.ne.jp” is registered in the white list corresponding to the user ID “suzuki” included in the individual address. Thereafter, the transfer processing unit 113 replaces the destination address with the real address and transmits the mail to the service user A mail server 210 (step S650).

  In this way, when a mail addressed to an individual address meets the transfer conditions, the sender address is automatically registered in the white list, so that the burden of registering the mail address that the user is allowed to receive in the white list is reduced. Can be reduced.

  In addition, instead of the case where the mail addressed to the individual address satisfies the transfer condition, the reply destination mail address can be automatically registered in the white list when a reply is made to the mail addressed to the individual address. FIG. 18 is a sequence diagram illustrating a processing procedure in which the mail delivery system according to the first embodiment automatically registers the reply destination mail address in the white list when a reply is made to the mail addressed to the individual address.

  As shown in FIG. 18, in the automatic registration process to the white list, when the service user A terminal 220 replies to the mail addressed to the individual address based on the instruction from the service user A230 (step S710), the mail transfer server 110 receives via the service user A mail server 210.

  Here, when the mail addressed to the individual address is sent to the service user A230, since the destination address is converted to the real address, is the reply mail sent from the service user A230 a reply to the mail addressed to the individual address? It cannot be specified from the sender address of the reply mail, but by adding information indicating that it is mail addressed to the individual address to the forwarded mail and reply mail converted from the individual address to the real address The mail transfer server 110 can determine whether the reply mail is a mail addressed to an individual address.

  For example, as shown in FIG. 19, when the mail transfer server 110 receives a mail whose destination address is the public address “suzuki@privango.net” and receives a mail addressed to the individual address after a request for resending the mail addressed to the individual address, The transfer processing unit 113 rewrites the individual address to the real address “suzuki1010@anywhere.ne.jp” and transmits it to the service user A230. At this time, the transfer processing unit 113 converts the real address “taro@isp-A.ne.jp” of the mail source into the format of “taro/isp-A.ne.jp/suzuki@privango.net” (hereinafter, “ (Reply format) and send email.

  When the reply mail for the mail addressed to the individual address is received, the mail transfer server 110 extracts the user ID “suzuki” from the reply destination address “taro/isp-A.ne.jp/suzuki@privango.net”. , Rewrite the destination address to “taro@isp-A.ne.jp” and rewrite the source address to “suzuki@privango.net” and forward the mail.

  In this way, the mail transfer server 110 rewrites the destination address from the individual address to the real address, rewrites the real address of the transmission source in the reply format, and receives the reply mail in which the destination address is the reply format. You can know that it is a reply mail for. In addition, by rewriting the destination address in the reply format to the real address and rewriting the transmission source address to the public address, disclosure of the real address can be prevented even when the user directly replies to the mail of the public address.

  Returning to FIG. 18, when the mail transfer server 110 receives a reply mail whose reply is in the reply format, the white list automatic processing unit 114 uses the user ID and the registered address (destination address) included in the reply address as white. Registration is requested to the whitelist registration processing unit 122 of the list / blacklist registration server 120 (step S720). For example, it requests registration of “taro@isp-A.ne.jp” to the white list corresponding to the user ID “suzuki”.

  Then, the mail transfer server 110 performs a source address rewriting process for rewriting the source address of the reply mail to the public address (step S730). For example, the sender address of the reply mail is rewritten as “suzuki@privango.net”. Then, the communication mail is transmitted to the communication partner B mail server 310 (step S740), and the mail received by the communication partner B mail server 310 is temporarily stored.

  Thereafter, when the communication partner B terminal 320 requests the communication partner B mail server 310 to confirm the arrival mail based on the instruction of the communication partner B 330 (step S750), the communication partner B mail server 310 transmits the temporarily stored mail to the communication partner B. It transmits to the terminal 320 (step S760).

  Thus, when a reply is made to a mail addressed to an individual address, the user ID and the mail address of the communication partner B330 are reproduced from the reply mail reply address and automatically registered in the white list. It is possible to reduce the burden of the user registering e-mail addresses permitted to be received on the white list.

[White List Registration Processing (Example 1)]
FIG. 20 is a flowchart showing a processing procedure of whitelist registration processing by the whitelist registration processing unit 122 of the whitelist / blacklist registration server 120. As shown in the figure, in this white list registration process, the white list registration processing unit 122 receives the user ID u and the registration address a, and first obtains the white list WL corresponding to the user ID u from the white list table 132. (Step S331). Here, user ID u = “suzuki”, registration address a = “taro@isp-A.ne.jp”, white list WL = {taro @ isp-A.ne.jp, anywhere.ne.jp}. .

  Then, the whitelist registration processing unit 122 sets w as an element in the whitelist WL, and determines whether there is a w that matches the registered address a (step S332). As a result, if there is no w that matches the registered address a, the registered address a is registered in the white list WL corresponding to the user ID u in the white list table 132 (step S333), and w that matches the registered address a is found. If there is, step S333 is skipped. Here, since the registered address a = “taro@isp-A.ne.jp” is in the white list WL={taro@isp-A.ne.jp, anywhere.ne.jp}, step S333 is skipped.

  Then, the white list registration processing unit 122 acquires the black list BL corresponding to the user ID u from the black list table 133 (step S334). Here, the black list BL={spammer@black.com}. Then, the whitelist registration processing unit 122 sets b as an element in the blacklist BL, and determines whether there is b that matches the registered address a (step S335). As a result, if there is b matching the registered address a, the registered address a is deleted from the black list BL corresponding to the user ID u in the black list table 133 (step S336), and b matching the registered address a is If not, step S336 is skipped. Here, since there is no b that matches the registered address a, step S336 is skipped.

  As described above, when the white list registration processing unit 122 registers the registration address in the white list, the white list and the black list are checked by checking that the same registration address is not registered in the white list and the black list. It is possible to ensure the correct filtering between the two.

[Black List Automatic Registration Processing and Automatic Deletion Processing (Example 1)]
FIG. 21 is a sequence diagram of the blacklist automatic registration process performed by the mail delivery system according to the first embodiment. In this case, when receiving an email from a communication partner B330 not registered in the white list or black list and notifying the individual address, it is assumed that the communication partner B330 is unreliable for the time being, and the destination address of the communication partner B330 is set. Register to blacklist.

  As shown in FIG. 21, in the blacklist automatic registration process, when the filter processing unit 112 requests the individual address issuing server 140 to issue an individual address (step S180), the blacklist automatic processing unit 115 The blacklist registration processing unit 123 of the whitelist / blacklist registration server 120 is requested to register the mail sender address (individual address destination address) in the blacklist corresponding to the user ID included in the individual address. (Step S185). Here, registration of “taro@isp-A.ne.jp” is requested to the black list corresponding to the user ID “suzuki”. When registration in the black list table 133 is completed, the filter processing unit 112 transmits the individual address to the communication partner B terminal 320 (step S190).

  In this way, the blacklist automatic processing unit 115 registers the communication partner B330 to which the individual address is transmitted to the blacklist for the time being, thereby reducing the burden of the user registering the email address to be rejected on the blacklist. Can do.

  However, when performing such automatic registration, it is necessary to delete the address automatically registered in the black list when it is determined that the communication partner B330 to which the individual address is transmitted can be trusted. A process for deleting an address automatically registered in the black list when it is determined that the communication partner B330 is reliable will be described.

  FIG. 22 shows that the mail delivery system according to the first embodiment automatically deletes the sender address from the black list when the communication partner B330 is found to be reliable, that is, when the mail addressed to the individual address satisfies the transfer condition. It is a sequence diagram which shows a processing procedure. As shown in FIG. 22, in this automatic deletion process from the black list, when the communication partner B 330 transmits a mail from the communication partner B terminal 320 in response to a mail resend request destined for an individual address (step S810), communication is performed. The partner B mail server 310 receives the mail and transmits it to the mail transfer server 110 (step S820). Here, the individual address “suzuki.sbtwr3gr5b@privango.net” is used as the destination address.

  Then, when the filter processing unit 112 of the mail transfer server 110 performs the delivery determination process shown in FIG. 13 (step S830) and determines that delivery is possible, the sender address from the black list corresponding to the user ID included in the individual address The blacklist automatic processing unit 115 requests the blacklist registration processing unit 123 of the whitelist / blacklist registration server 120 to delete (step S840). For example, a request is made to delete the sender address “taro@isp-A.ne.jp” from the black list corresponding to the user ID “suzuki” included in the individual address. Thereafter, the transfer processing unit 113 replaces the destination address with a real address and transmits a mail to the service user A mail server 210 (step S850).

  As described above, when the mail addressed to the individual address satisfies the transfer condition, the sender address is automatically deleted from the black list, so that the mail address registered in the black list can be deleted from the black list for the time being.

[Black List Registration Process (Example 1)]
FIG. 23 is a flowchart showing a processing procedure of blacklist registration processing by the blacklist registration processing unit 123 of the whitelist / blacklist registration server 120. As shown in the figure, in this blacklist registration process, the blacklist registration processing unit 123 receives the user ID u and the registration address a, and first acquires the blacklist BL corresponding to the user ID u from the blacklist table 133. (Step S431). Here, it is assumed that the user ID u = “suzuki”, the registered address a = “spammer@black.com”, and the black list BL={spammer@black.com}.

  Then, the blacklist registration processing unit 123 sets b as an element in the blacklist BL, and determines whether there is b that matches the registered address a (step S432). As a result, if there is no b matching the registered address a, the registered address a is registered in the black list BL corresponding to the user ID u of the black list table 133 (step S433), and b matching the registered address a is If there is, step S433 is skipped. Here, since the registered address a = “spammer@black.com” is in the black list BL={spammer@black.com}, step S433 is skipped.

  Then, the black list registration processing unit 123 acquires the white list WL corresponding to the user ID u from the white list table 132 (step S434). Here, the white list WL={taro@isp-A.ne.jp, anywhere.ne.jp}. Then, the blacklist registration processing unit 123 sets the element in the whitelist WL as w, and determines whether there is a w that matches the registered address a (step S435). As a result, if there is w that matches the registered address a, the registered address a is deleted from the white list WL corresponding to the user ID u in the white list table 132 (step S436), and w that matches the registered address a is found. If not, step S436 is skipped. Here, since there is no w that matches the registered address a, step S436 is skipped.

  As described above, when the blacklist registration processing unit 123 registers the registration addresses in the blacklist, the blacklist registration processing unit 123 checks that the same registration address is not registered in the whitelist and the blacklist. It is possible to ensure the correct filtering between the two.

[Effect of Example 1]
As described above, according to the first embodiment, the data management server 130 stores the white list and the black list in the white list table 132 and the black list table 133 in association with the user ID, respectively. When the address generation unit 142 generates an individual address, and the filter processing unit 112 of the mail transfer server 110 determines whether or not the mail addressed to the public address can be transferred using the white list and the black list, and the transfer possibility is unknown Requests the sender of the mail to resend the mail using the individual address generated by the address generation unit 142, and sends the mail to the recipient when the mail sent to the individual address satisfies the transfer condition. Since it was decided to transfer, Realization of an e-mail delivery system with the simplicity provided by the whitelist and blacklist for spam and the certainty provided by the e-mail delivery system using conditional individual addresses Can do.

  Further, according to the first embodiment, when the user transmits mail to a new communication partner, the white list automatic processing unit 114 of the mail transfer server 110 registers the mail address of the communication partner in the white list, and the white list When a mail is received from a communication partner who is not registered in the list or black list, when it is determined that the communication partner is reliable or when a reply is made to the communication partner, the mail address of the communication partner is whitelisted Therefore, it is possible to reduce the burden of the user maintaining the white list.

  Further, according to the first embodiment, when the black list automatic processing unit 115 of the mail transfer server 110 receives a mail from a communication partner that is not registered in the white list or the black list, the mail address of the communication partner is set. Since the e-mail address once registered in the black list is deleted when the communication partner is found to be reliable, the burden of maintaining the black list by the user can be reduced.

  Further, according to the first embodiment, the whitelist / blacklist registration server 120 of the whitelist / blacklist registration server 120 sets the email address or domain name that the whitelist / blacklist allows / rejects reception to / from the whitelist / blacklist. When registering, check whether the email address or domain name that matches the email address or domain name to be registered is in the blacklist / whitelist, and register the same email address or domain name in the whitelist and blacklist As a result, it is possible to guarantee the correct mail transfer because it is prevented from being inconsistent.

  In the first embodiment, when the individual address is rewritten to the real address and transmitted to the service user A230, the transfer processing unit 113 rewrites the mail source address (mail address of the communication partner B330) into the reply format. When the mail transfer server 110 receives the reply mail addressed to the reply address, the mail transfer server 110 extracts the user ID from the reply address, rewrites the destination address to the mail address of the communication partner B330, and returns the reply mail. Since the mail source address is rewritten to the public address and the mail is transferred, it is possible to prevent the real address of the service user A230 from being disclosed in the reply mail.

  By the way, in the first embodiment, the case where mail delivery using individual addresses is performed to eliminate junk mail when the mail sender address is not registered in either the white list or the black list has been described. However, it is also possible to eliminate junk mail by using other methods instead of mail delivery using individual addresses. Therefore, in a second embodiment, a mail delivery system that eliminates spam mail by combining mail delivery based on NG words with a white list and a black list instead of mail delivery using individual addresses will be described. In the second embodiment, after describing the configuration of the mail delivery system, the mail transfer process procedure of the mail delivery system will be described, and finally the effects of the second embodiment will be described.

[Configuration of mail delivery system (Example 2)]
First, the configuration of the mail delivery system according to the second embodiment will be described with reference to FIG. FIG. 24 is a diagram illustrating a configuration of the mail delivery system according to the second embodiment. Here, for convenience of explanation, functional units that play the same functions as the respective units shown in FIG.

  As shown in FIG. 24, in comparison with the mail delivery system shown in FIG. 1, this mail delivery system is provided with a mail transfer server 510 instead of the mail transfer server 110, and instead of the whitelist / blacklist registration server 120. A white list / black list registration server 520 is provided, and a data management server 530 is provided instead of the data management server 130. The mail transfer server 510 includes a filter processing unit 512 instead of the filter processing unit 112, the white list / black list registration server 520 further includes an NG word registration processing unit 524, and the data management server 530 includes: Further, an NG word table 534 is provided.

  The NG word is a word for discarding the mail as a junk mail when it is included in the body of the mail. The NG word table 534 of the data management server 530 stores the user ID and the NG word list in association with each other. FIG. 25 is a diagram illustrating an example of the NG word table 534. As shown in the figure, this NG word table 534 stores the NG word “spam” and “discount software” in association with the user ID “suzuki”, and the NG word “pirated version” in correspondence with the user ID “tanaka”. “DVD” is stored, and NG words “free cable TV” and “discount” are stored in correspondence with the user ID “yamada”. The NG word registration processing unit 524 of the white list / black list registration server 520 is a processing unit that performs registration processing of an NG word in the NG word list.

  The filter processing unit 512 of the mail transfer server 510 is a processing unit that determines whether mail can be transferred based on the NG word table 534 when the sender address is not registered in the white list and the black list.

  The filter processing unit 512 can determine whether mail can be transferred based on the NG word, so that it is possible to determine whether mail can be transferred with unknown white list or black list.

[Mail transfer processing (Example 2)]
Next, a processing procedure of mail transfer processing by the mail delivery system according to the second embodiment will be described. FIG. 26 is a sequence diagram of the mail transfer process performed by the mail delivery system according to the second embodiment. However, here, only the processing when mail transfer feasibility is unknown as a result of the filtering process based on the white list and the black list is different from that in the first embodiment, and thus the processing procedure when mail transfer feasibility is unknown Only will be described.

  As shown in FIG. 26, in this mail transfer process, the filter processing unit 512 uses the NG word table 534 to determine whether transfer is possible for mail whose transferability is unknown as a result of the filtering process using the white list and black list. Is performed (step S910). As a result, when it is determined that the mail can be transferred, the transfer processing unit 113 acquires the real address from the real address table 131 (step S920), and transmits the mail using the real address as the transfer destination (step S930). Then, the mail received by the service user A mail server 210 is temporarily stored.

  Thereafter, when the service user A terminal 220 requests the service user A mail server 210 to confirm the arrival mail based on the instruction from the service user A 230 (step S940), the service user A mail server 210 stores the temporarily stored mail. Is transmitted to the service user A terminal 220 (step S950).

  As described above, the filter processing unit 512 of the mail transfer server 510 refers to the NG word table 534 to determine whether mail can be transferred, thereby transferring mail whose sender address is not registered in the white list and black list. Whether it is possible or not can be determined.

[NG Word Filter Processing (Example 2)]
Next, a processing procedure of NG word filter processing (processing corresponding to step S910 shown in FIG. 26) by the filter processing unit 512 will be described. FIG. 27 is a flowchart illustrating a processing procedure of NG word filter processing by the filter processing unit 512.

  As shown in the figure, in this filter processing, the filter processing unit 512 receives the destination address and the mail text, and acquires the user ID u from the destination address (step S911). Here, “suzuki” is acquired as u.

  Then, the filter processing unit 512 acquires the NG word list NGL corresponding to the user ID from the NG word table 534 (step S912). Here, it is assumed that the NG word list NGL = {spam, discount software}.

  Then, the filter processing unit 512 sets ng as the element in the NG word list NGL, and determines whether ng appears in the mail body (step S913). As a result, when ng appears, the filter processing unit 512 determines that transfer is not possible (step S914a), and when ng does not appear, determines that transfer is possible (step S914b). It should be noted that here, when “spam” or “discount software” appears in the mail text, it is determined that transfer is impossible.

  In this way, the filter processing unit 512 eliminates junk mail by determining whether or not an NG word appears in the mail body for mail determined to be untransferable by the white list and black list. Can do.

[Effect of Example 2]
As described above, according to the second embodiment, the white list and the black list are determined by combining the determination of whether mail transfer is possible using the white list and the black list with other filtering processes such as determination of mail transfer based on the NG word. A list can be used together.

[Other examples]
In the first and second embodiments, the automatic registration of the white list has been described. However, the last mail transmission date, the last mail transmission time, the last mail reception date, and the last mail reception time with each communication partner for each user. When the communication history information is stored as communication history information, and the difference between the communication history information and the current date such as the current date and time is larger than a predetermined value, mail transmission / reception is performed for a predetermined period. It is also possible to automatically delete the mail address corresponding to the communication partner from the white list as if it is not. Similarly, for the black list, the last reception time such as the last mail reception date and the last mail reception time from each sender is stored as communication history information for each user, and the communication history information and the current date and time are stored. If the difference between the current time and the current time is larger than a predetermined value, it is possible to automatically delete the corresponding mail address from the black list on the assumption that no mail has been received for a predetermined period.

  In addition, for each user for the white list and the black list, the maximum number of registrations is set, and when registering each in the white list and the black list, if the maximum number of registrations has already been performed, By referring to the communication history information, it is possible to automatically delete the mail addresses registered in the white list and the black list, respectively, with the oldest mail communication time or the oldest mail reception time.

  Further, as communication history information, it is possible to store a communication frequency instead of the last communication time point and automatically delete information with a low communication frequency from the white list.

  In this section, the whitelist automatic registration / automatic deletion and the blacklist automatic registration / automatic deletion of the three-layer mail delivery system that combines the whitelist, blacklist, and other filtering methods have been described. Automatic registration / deletion and automatic blacklist registration / deletion are either a mail delivery system that uses only a whitelist or blacklist, or a two-layer mail delivery system or blacklist that combines a whitelist with other filtering methods. Each can be applied to a two-layer mail delivery system combined with other filtering methods.

  Conventionally, automatic deletion of the white list and black list suddenly stops receiving emails from people who have been permitted to receive, and conversely, spam emails suddenly arrive. Automatic deletion of the list was impossible in terms of service. However, two-layer transfer control that combines the white list and other filtering methods, two-layer transfer control that combines the black list and other filtering methods, or three layers that combine the white list, black list, and other filtering methods. By performing the transfer control, it is possible to automatically delete the white list and the black list in terms of service.

  In the first and second embodiments, the case where the mail address and the domain name are registered in the white list and the black list has been described. However, the present invention is not limited to this, and other information related to the sender of the mail. This can also be applied in the same way when determining whether or not mail can be transferred by registering in the white list and black list.

  In the first and second embodiments, the mail delivery system has been described from the functional aspect. However, in practice, each device such as the mail transfer server 110 and the data management server 130 is realized by a commercially available computer. You can install programs on each of these computers. This program may be loaded not only from a secondary recording medium such as a hard disk device or a ROM but also from a recording medium such as a CD-R. For example, when loading a program from a CD-R, a mail transfer server 110 program, a data management server 130 program, etc. are stored in advance on a CD-R (may be a separate CD-R for each device). The CD-R is loaded into the CD-R reader of each device, and the program is loaded.

  In the first and second embodiments, the case of using four server devices, that is, a mail transfer server, a whitelist / blacklist registration server, a data management server, and an individual address issuing server has been described. However, the present invention is not limited to this. For example, when the functions of the whitelist / blacklist registration server and the data management server are provided by one server device, or when all the functions are provided by one server device, the same applies. Can be applied to.

  In the first and second embodiments, the case has been described in which a mail address used for an electronic mail message such as Internet mail or mobile mail is targeted. However, the present invention is not limited to this, for example, It is also possible to target message addresses used for so-called instant messages, presence exchange messages, SIP messages such as IP telephone control messages. In other words, the present invention can be similarly applied not only when delivering e-mail messages between users, but also when delivering SIP messages such as instant messages, presence exchange messages, and IP phone control messages. it can.

  In the first and second embodiments, the case where the mail destination address (TO address) is replaced with the real address has been described for transfer. However, it is not essential to replace the destination address during the transfer. In the transfer protocol for transferring mail data to the mail server without replacing the destination address, the mail may be transferred by defining the real address of the mail transfer destination.

  In the first and second embodiments, the case where the mail transfer server transfers the mail to the mail server for the callee has been described. However, the present invention is not limited to this. By having the role of a mail server for recipients, mail that has a delivery judgment result is distributed to the recipient's message box (box corresponding to the recipient's real address) provided in the mail transfer server. You may make it store.

  As described above, the message delivery system, the message transfer apparatus, the message transfer method, and the message transfer program according to the present invention are useful for message delivery that eliminates annoying messages. This is suitable for reducing the burden of registering user information.

1 is a diagram illustrating a configuration of a mail delivery system according to a first embodiment. It is a figure which shows an example of a public address. It is a figure which shows an example of an individual address. It is a figure which shows an example of a real address table. It is a figure which shows an example of a white list table. It is a figure which shows an example of a black list table. It is a figure which shows disclosure of a public address. It is a sequence diagram (1) which shows the process sequence of the mail transfer process by the mail delivery system which concerns on Example 1. FIG. It is a sequence diagram (2) which shows the process sequence of the mail transfer process by the mail delivery system which concerns on Example 1. FIG. It is a sequence diagram (3) which shows the process sequence of the mail transfer process by the mail delivery system which concerns on Example 1. FIG. It is a flowchart which shows the process sequence of the filter process by a filter process part. It is a sequence diagram which shows the process sequence of the address generation process by an address generation part. It is a flowchart which shows the detail of the mail delivery determination process by a filter process part. FIG. 10 is a sequence diagram illustrating a processing procedure for registering a reception-permitted address and a reception-permitted domain name to a white list by the mail delivery system according to the first embodiment. It is a sequence diagram which shows the process sequence of the registration process of the reception refusal address to a black list and a reception refusal domain name by the mail delivery system which concerns on Example 1. FIG. FIG. 10 is a sequence diagram illustrating a processing procedure in which the mail delivery system according to the first embodiment automatically registers a destination address in a white list when a service user A transmits a mail to a new communication partner B. FIG. 10 is a sequence diagram illustrating a processing procedure in which a mail delivery system according to the first embodiment automatically registers a sender address in a white list when a mail addressed to an individual address satisfies a transfer condition. FIG. 10 is a sequence diagram illustrating a processing procedure in which the mail delivery system according to the first embodiment automatically registers a reply destination mail address in a white list when a reply is made to a mail addressed to an individual address. It is explanatory drawing for demonstrating the address of a reply format used for identification of the reply mail with respect to mail addressed to an individual address. It is a flowchart which shows the process sequence of the white list registration process by the white list registration process part of a white list and black list registration server. It is a sequence diagram which shows the process sequence of the black list automatic registration process by the mail delivery system which concerns on Example 1. FIG. When it is found that the communication partner B is reliable, that is, when a mail addressed to an individual address satisfies a transfer condition, the mail delivery system according to the first embodiment automatically deletes the sender address from the black list. It is a sequence diagram. It is a flowchart which shows the process sequence of the black list registration process by the black list registration process part of a white list black list registration server. It is a figure which shows the structure of the mail delivery system which concerns on Example 2. FIG. It is a figure which shows an example of a NG word table. It is a sequence diagram which shows the process sequence of the mail transfer process by the mail delivery system which concerns on Example 2. FIG. It is a flowchart which shows the process sequence of the NG word filter process by a filter process part.

Explanation of symbols

100 LAN
110, 510 Mail transfer server 111 Mail communication unit 112, 512 Filter processing unit 113 Transfer processing unit 114 White list automatic processing unit 115 Black list automatic processing unit 120, 520 White list / black list registration server 121 HTTP communication unit 122 White list registration Processing unit 123 Black list registration processing unit 130, 530 Data management server 131 Real address table 132 White list table 133 Black list table 140 Individual address issuing server 141 Communication unit 142 Address generation unit 210 Service user A mail server 220 Service user A Terminal 230 Service user A
240 service user A side IP network 310 communication partner B mail server 320 communication partner B terminal 330 communication partner B
340 Communication partner B side IP network 400 Internet 524 NG word registration processing unit 534 NG word table

Claims (30)

A message delivery system for delivering a message based on caller information, which is information about a message sender,
A permitted caller information storage means for storing one or more caller information for each user, which is permitted caller information that is information about each caller that the user permits to receive;
An authorized caller information automatic registration means for automatically registering information about the communication partner in the authorized caller information storage means when a user sends a message to a new communication partner;
A message delivery system comprising: A message delivery system for delivering a message based on caller information, which is information about a message sender,
A permitted caller information storage means for storing one or more caller information for each user, which is permitted caller information that is information about each caller that the user permits to receive;
Communication history information storage means for storing communication history information with each communication partner for each user;
Based on the communication history information stored in the communication history information storage means, the permitted caller information automatic deletion means for specifying and deleting the permitted caller information to be automatically deleted from the permitted caller information storage means;
A message delivery system comprising: The communication history information storage means stores the last message communication time as communication history information,
The permitted sender information automatic deletion means compares the last message communication time point stored in the communication history information storage means with the current time point and corresponds to the user and the communication partner when the difference is larger than a predetermined value. 3. The message delivery system according to claim 2, wherein the permitted sender information is automatically deleted from the permitted sender information storage means. The communication history information storage means stores the last message communication time as communication history information,
The authorized sender information automatic deletion means is stored in the authorized sender information storage means for the user when new authorized sender information is registered in the authorized sender information storage means in association with the user. When the number of permitted sender information is a predetermined maximum value, among the permitted sender information stored for the user, the last message communication time point stored in the communication history storage means is related to the oldest communication partner. The message delivery system according to claim 2, wherein the permitted sender information is deleted. A message delivery system for delivering a message based on caller information, which is information about a message sender,
A permitted caller information storage means for storing one or more caller information for each user, which is permitted caller information that is information about each caller that the user permits to receive;
Rejected caller information storage means for storing rejected caller information that is information about each caller that the user refuses to receive for one or more callers for each user;
When new permitted sender information is registered in the permitted sender information storage means, if the information that matches the new permitted sender information is stored in the rejected sender information storage means, the match Permission caller information registration executing means for deleting information from the rejected caller information storage means;
A message delivery system comprising: A message delivery system for delivering a message based on caller information, which is information about a message sender,
Rejected caller information storage means for storing rejected caller information that is information about each caller that the user refuses to receive for one or more callers for each user;
Communication history information storage means for storing communication history information with each communication partner for each user;
Based on the communication history information stored in the communication history information storage means, the rejected caller information automatic deletion means for specifying and deleting rejected caller information to be automatically deleted from the rejected caller information storage means;
A message delivery system comprising: The communication history information storage means stores the last message communication time as communication history information,
The rejected caller information automatic deletion means compares the last message communication time point stored in the communication history information storage means with the current time point and corresponds to the user and the communication partner when the difference is larger than a predetermined value. 7. The message delivery system according to claim 6, wherein rejected caller information is automatically deleted from the rejected caller information storage means. The communication history information storage means stores the last message communication time as communication history information,
The rejected caller information automatic deletion means is stored in the rejected caller information storage means for the user when new rejected caller information is registered in the rejected caller information storage means in association with the user. When the number of rejected caller information is a predetermined maximum value, among the rejected caller information stored for the user, the last message communication time point stored in the communication history storage means is related to the oldest communication partner. 7. The message delivery system according to claim 6, wherein the rejected sender information is deleted. A message delivery system for delivering a message based on caller information, which is information about a message sender,
A permitted caller information storage means for storing one or more caller information for each user, which is permitted caller information that is information about each caller that the user permits to receive;
Rejected caller information storage means for storing rejected caller information that is information about each caller that the user refuses to receive for one or more callers for each user;
When new rejected caller information is registered in the rejected caller information storage unit, if the information that matches the new rejected caller information is stored in the permitted caller information storage unit, the match Rejected caller information registration executing means for deleting information from the permitted caller information storage means;
A message delivery system comprising: Each permitted sender information corresponding to the destination of the arrived message is read from the permitted sender information storage means and compared with the sender information of the message. If there is a matching permitted sender information, the message can be transferred. Transfer permission determination means for determining
Transfer permission determination means for determining whether the message can be transferred when the transfer permission determination means determines that the message transfer is not possible;
10. The message delivery system according to claim 2, 3, 4, or 9, further comprising: Each rejected sender information corresponding to the destination of the arrived message is read from the rejected sender information storage means and compared with the sender information of the message, and if there is matching rejected sender information, the message cannot be transferred. A transfer rejection determination means for determining
Transfer permission determination means for determining whether the message can be transferred when the transfer rejection determination means determines that the message transfer is not possible;
The message delivery system according to claim 5, further comprising: A message transfer device that transfers a message based on caller information that is information about the caller of the message,
Provided with a permitted caller information automatic registration means for automatically registering information regarding a communication partner as permitted caller information regarding a caller permitted to receive when the user transmits a message to a new communication partner. A message transfer device. A message transfer device that transfers a message based on caller information that is information about the caller of the message,
Based on the communication history information with each communication partner of each user, the permitted caller information to be automatically deleted from the information registered as permitted caller information for each caller permitted to receive by the user is specified. An apparatus for automatically deleting authorized caller information to be deleted. The communication history information is the last message communication time,
The permitted sender information automatic deletion means compares the last message communication time point with each communication partner of each user and the current time point, and if the difference is larger than a predetermined value, the permitted sender information of the user 14. The message transfer device according to claim 13, wherein the permitted caller information corresponding to the communication partner is automatically deleted from the inside. The communication history information is the last message communication time,
When the permitted caller information automatic deletion means registers the permitted caller information newly corresponding to the user, the number of permitted caller information already registered for the user is a predetermined maximum value. 14. The message transfer apparatus according to claim 13, wherein the permitted caller information relating to the communication partner whose oldest message communication time is the oldest is deleted from the permitted caller information already registered for the user. . A message transfer device that transfers a message based on caller information that is information about the caller of the message,
When newly registering authorized caller information, which is information related to each caller permitted to be received by the user, corresponding to the user, the information that matches the new permitted caller information is rejected by the user. A message transfer apparatus comprising: permitted caller information registration executing means for deleting the matching rejected caller information when registered as rejected caller information that is information relating to each caller. A message transfer device that transfers a message based on caller information that is information about the caller of the message,
Based on the communication history information with each communication partner of each user, the rejected caller information to be automatically deleted from the information registered as rejected caller information for each caller that the user refuses to receive is specified. A message transfer device, comprising: rejected caller information automatic deletion means for deleting the message. The communication history information is the last message communication time,
The rejected caller information automatic deletion means compares the last message reception time from each caller of each user with the current time point, and if the difference is larger than a predetermined value, the rejected caller information of the user 18. The message transfer device according to claim 17, wherein the rejected caller information corresponding to the caller is automatically deleted from the inside. The communication history information is the last message communication time,
When the rejected caller information automatic deletion means registers the rejected caller information newly corresponding to the user, the number of rejected caller information already registered for the user is a predetermined maximum value Is characterized in that, among the rejected caller information already registered for the user, the rejected caller information related to the caller having the oldest message reception time is deleted and new rejected caller information is registered. The message transfer device according to claim 17. A message transfer device that transfers a message based on caller information that is information about the caller of the message,
When newly registering rejected caller information, which is information about each sender that the user refuses to receive, in association with the user, the information that matches the new rejected caller information is allowed for the user to receive A message transfer apparatus comprising: a rejected caller information registration executing unit that deletes the matching permitted caller information when registered as permitted caller information that is information relating to each caller to perform. A message transfer method by a message transfer device that transfers a message based on caller information that is information about the caller of the message,
Including a permitted caller information automatic registration step of automatically registering information related to the communication partner as permitted caller information related to the caller permitted to receive when the user sends a message to a new communication partner. A characteristic message transfer method. A message transfer method by a message transfer device that transfers a message based on caller information that is information about the caller of the message,
Based on the communication history information with each communication partner of each user, the permitted caller information to be automatically deleted from the information registered as permitted caller information for each caller permitted to receive by the user is specified. A message transfer method characterized by including a process of automatically deleting authorized sender information to be deleted. The communication history information is the last message communication time,
The permitted sender information automatic deletion step compares the time of receiving the final message from each sender of each user and the current time, and if the difference is larger than a predetermined value, the permitted sender information of the user 23. The message transfer method according to claim 22, wherein the permitted caller information corresponding to the caller is automatically deleted from the inside. The communication history information is the last message communication time,
When the permitted caller information automatic deletion step registers the permitted caller information newly corresponding to the user, the number of permitted caller information already registered for the user is a predetermined maximum value. Is characterized in that, among the authorized sender information already registered for the user, the authorized sender information relating to the sender having the oldest message reception time is deleted and new authorized sender information is registered. The message transfer method according to claim 22. A message transfer method by a message transfer device that transfers a message based on caller information that is information about the caller of the message,
When newly registering authorized caller information, which is information related to each caller permitted to be received by the user, corresponding to the user, the information that matches the new permitted caller information is rejected by the user. A message transfer method characterized by including a permitted caller information registration executing step of deleting the matching rejected caller information when registered as rejected caller information that is information relating to each caller. A message transfer method by a message transfer device that transfers a message based on caller information that is information about the caller of the message,
Based on the communication history information with each communication partner of each user, the rejected caller information to be automatically deleted from the information registered as rejected caller information for each caller that the user refuses to receive is specified. A message transfer method characterized by including a step of automatically deleting rejected caller information to be deleted. The communication history information is the last message communication time,
The rejected caller information automatic deletion step compares the final message reception time from each caller of each user with the current time point, and if the difference is larger than a predetermined value, 27. The message transfer method according to claim 26, wherein rejected caller information corresponding to the caller is automatically deleted from the inside. The communication history information is the last message communication time,
In the rejected caller information automatic deletion step, when the rejected caller information is newly registered in association with the user, the number of rejected caller information already registered for the user is a predetermined maximum value. Is characterized in that, among the rejected caller information already registered for the user, the rejected caller information related to the caller having the oldest message reception time is deleted and new rejected caller information is registered. The message transfer method according to claim 26. A message transfer method by a message transfer device that transfers a message based on caller information that is information about the caller of the message,
When newly registering rejected caller information, which is information about each sender that the user refuses to receive, in association with the user, the information that matches the new rejected caller information is allowed for the user to receive A message transfer method characterized by including a rejected caller information registration executing step of deleting the matched permitted caller information when registered as permitted caller information, which is information relating to each caller.   A message transfer program for causing a computer to execute the message transfer method according to any one of claims 21 to 29.

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