major.io words of wisdom from a systems engineer

Enable submission port 587 in Postfix

Enabling submission port support for Postfix is really easy. To have postfix listen on both 25 and 587, be sure that the line starting with submission is uncommented in /etc/postfix/master.cf:

smtp      inet  n       -       n       -       -       smtpd
submission inet n      -       n       -       -       smtpd