SMTP 2 Telegram very simple relay.
It's a fork of abandoned ircop/smtp2tg. Contains several improvements that original maintainer may not want to merge. The difference:
- docker container build ghcr.io/paulannekov/smtp2tg
- fresh Go version with go modules
- fallback to email if Telegram API is unavailable
- support of message pinning when email address contains
+pintag - several refactorings
Building requires go version go1.18.0. You may use older versions, but without any warranty.
Before build, you must instal packages:
go get
And build program:
go build
Copy binary file to /usr/local/bin, or just run from building directory:
./smtp2tg
or
./smtp2tg -c /etc/smtp2tg.toml
If you want to listen 25 port, you need run program as root.
docker run -v $(pwd)/smtp2tg.toml:/config/smtp2tg.toml:ro --name smtp2tg ghcr.io/paulannekov/smtp2tg:latestUnfortunately, golang has some problems with daemonizing: golang/go#227
You can "daemonize" smtp2tg with system tools, like start-stop-daemon
You need to point valid dns MX-record to ipaddr, on which daemon is listening. Example, if smtp2tg is listening on 1.2.3.4:
$ORIGIN example.com.
...
alert A 1.2.3.4
alert IN MX 10 alert.example.com.
And then just send email to user@alert.example.com