Relay Mail With Postfix and Stunnel
Let’s say you’ve just installed your own virtual server running Postfix. Now you want to send mail from it to the outside world. You don’t want the work of running a full-blown mail server. That would be like delivering a letter in person, instead of letting the United States Postal Service pick it up. You want an easier way, one where you can hand off (relay) the mail, using a single e-mail account you already own.