3 ms·

>You never really could. You can, open a TCP socket on port 25 to $IP, and just start sending email headers. You can also use local domains, no DNS. You can

by TZubiri 4mo ago

>You never really could. You can, open a TCP socket on port 25 to $IP, and just start sending email headers. You can also use local domains, no DNS. You can also leave a file in the /var/mail directory with the filename of the user.