I have been wrestling with this of late and stumbled upon this article in the Linux Gazette (http://linuxgazette.net/105/youngman.html).
The overview is excellent and can help in identifying methods for further battling the ever increasing volume of spam going through our mail servers.
In particular, I like the coverage of white and blacklisting, bayesian filtering and tweaking spam hits scores.
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August 31st, 2004 at 9:12 pm
The most important point missed in the article: whitelist *sitepoint.com :)