sudo apt update
sudo apt install libnet-ssleay-perl libio-socket-ssl-perlsudo dnf install perl-Net-SSLeay perl-IO-Socket-SSLIf it is an old version of CentOS:
sudo yum install perl-Net-SSLeay perl-IO-Socket-SSL./sendEmail.pl \
-f noreply@example.com \
-u user \
-m message \
-t destination@example.com \
-s your-mail-server.example.com \
-o tls=yes \
-xu smtp-user \
-xp smtp-pass