Using SpamAssassin on Mac OS X
[http://www.stupidfool.org/docs/sa.html Installing SpamAssassin]: Benjamin Trott of [http://www.movabletype.org/ MovableType] describes the process of installing SpamAssassin on OS X. It assumes that you are using a POP mail server (it could be tweaked to work IMAP, but if you're using IMAP, the popread script won't work). It also assumes that you are using a mail client that can read from mailbox-format files.
[http://developer.apple.com/server/virusfiltering.html Using Open Source Tools to Filter Email on Mac OS X Server]: Apple steps you through the installation and setup of some widely-used tools: Perl-based Amasvisd-new, Spam Assassin, and ClamAV. There are other, similar open-source tools available, but completing this exercise shows you one way to keep your mail server clean of viruses; you can try other solutions, as well.
[http://niklas.sosdata.se/index_man_macosxcommunigate.php Using Stalker CommuniGate]: on a Mac OS X 10.3 machine.
[http://www.tenon.com/products/post_office Tenon's Post.Office] is a commercial package which comes with a Spam{{`Assassin module (the 10 user version is free). [http://www.euregio.net/joe/postoffice/ Scripts and tips] for using Spam}}Assassin and Post.Office. The [http://dbmscan.com:3455/poss/58 Post.Office Wiki] has information about advanced Spam`Assassin setups.