I have been using qmailsince 1998 and I had a website called nospam.mine.nu where I had a series of articles about how to combat spam in individual articles and also my own qmail guide. The qmail guide was similar to qmailrocks but I mostly focused on running it on FreeBSD (which was 4.11 at the time I believe) and utilizing ports for the installation and upgrades. The most current guide hasn't been updated in some time and POP3 is still running on port 110 and there is no help with combating spam. I am pleased to announce that I am working on an update guide. The new qmail 2.0 guide will feature the following:
Completely secure POP3, SMTP (SSL AND TLS), and Webmail
A new guide on how to combat spam
A guide on how to configure webmail securely using Apache 2.4
This guide will require you to purchase a certificate from godaddy for your domain for SMTP, POP3 and Apache SSL. I will show you how to convert the purchased SSL Certificate to use with qmail.
The testing guide will be available for all registered users.