Michael Tsai has released SpamSieve 2.4.3, an update to his Bayesian spam filtering utility for popular email clients such as Apple Mail, Mailsmith, Entourage, PowerMail, and Eudora. The new version offers numerous changes, all of which are documented on the site. SpamSieve is priced at US$25 and requires Mac OS X 10.2 or later (10.3.5 or later recommended).