Postfix MTA configuration problems and solutions Ubuntu 12.04
Not all of us do mail server configuration everyday, so it is easy to get lost on unfamiliar grounds.
Fortunately, there is fantastic (up to date / unofficial) postfix documentation, it is the best I’ve seen on the net, this guide explains how to get following oiled and running:
Ubuntu + Postfix + Courier IMAP + MySQL + Amavisd-new + SpamAssassin + ClamAV + SASL + TLS + Roundcube + Postgrey. (Besides roundcube I think everything is essential).
I followed this guide to the word, but got myself into trouble on several occasions. Internet research didn’t yield any results, so I had to solve problems myself.