This post is inspired by Russ Whittmann and Europheus’ solutions , with these goals/improvements in mind:

• Move spam marked by spamassassin into a special Spam folder in each account (flabergasted this isn’t standard on something like PLESK!)
• Allow for quota, which is available on some PLESK servers (I previously thought it was available on all servers until recently) .
• Make a solution with as minimal manual labour as possible outside the PLESK control panel, which relates most specifically to having to edit and create .qmail and .procmailrc files each time you change or add an email account.
• Avoid having to have a special .procmailrc file for every user, one recipe for all!

(more…)

It’s possible to have a server act as a backup server, so in the unfortunate event that your main mail server goes down, mail gets queued up on the backup server until the main one is fixed.

Setting up PLESK to act as a backup MX server is fairly easy, here’s what to do. (more…)

Here’s some handy tips for managing your qmail queue on a linux machine, which can be helpful for debugging:
(more…)