http://www.macnn.com/articles/03/09/10/spamsieve.2/
SpamSieve 2 improves Bayesian spam filtering
updated 09:50 am EDT, Wed September 10, 2003
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C-Command's brings Bayesian spam filtering to virtually any e-mail client under Mac OS X: "It learns what your spam looks like, so it can block nearly all of it. It looks at your address book and learns what your good messages look like, so it won't confuse them with spam. SpamSieve actually gets better over time as you train it with more messages." It now extracts more information from messages for better accuracy, integrates with Eudora 6 via a plugin, features a blocklist and a whitelist, offers control over its filtering aggressiveness, and other filtering enhancements. It is a free update to the $25 application.
Fresh-Faced Recruit
Joined: Jul 2001
Mail.app
Why not just use Apples built in Mail application?