You should not run your mail server because mail is hard.
Contrary to the title, Gilles Chehade that it's acutually doable running your own mailserver.
TL;DR: Mail is not hard: people keep repeating that because they read it, not because they tried it. Big Mailer Corps are quite happy with that myth, it keeps their userbase growing. Big Mailer Corps control a large percentage of the e-mail address space which is good for none …
Read more [poolp.org]