How to set up a mail server on a GNU / Linux system

Easy to follow howto on setting up a mail server. Based on an Ubuntu distribution platform, but instructions are distro generic.

If you want to use the Debian way to a Postfix mail server, there is a guide here:
http://johnny.chadda.se/2005/04/30/postfix-howto/

Only PDF at the moment I'm afraid.

Here is a step by step on Debian that includes antivirus and spam filtering:
http://www.fatofthelan.com/articles/articles.php?pid=22



Zimbra includes all* this and makes install as simple as: "./install.sh".

http://www.zimbra.com

* AJAX UI rather than SquirrelMail
Internal IMAP rather than Courier

http://www.qmailrocks.org

The most comprehensive mail server setup guide for freebsd, linux, solaris, etc... Oh yeah Qmail is the fastest and most badass mail server no the planet. Google (gmail) runs a modified version of it, same with yahoo.

QmailRocks is good for most distro's, but for RPM Based distros, there is also the QmailToaster

http://digg.com/linux_unix/Qmail_Toaster_makes_mail_server_setup_easy

This project has made it very easy for any RPM based Linux distro to become a full functioning mail server, complete with webmail and imap-ssl.