SpamSieve 1.3 is now available.

Like your professional e-mail client, but jealous of Mail.app's spam
filter? SpamSieve brings powerful Bayesian spam filtering to other popular
e-mail clients. It learns what your spam looks like, so it can block nearly
all of it. It also learns what your good messages look like, so it won't
confuse them with spam. Other spam filters get worse over time as spammers
adapt to their rules; SpamSieve actually gets better over time as you train
it with more messages. SpamSieve doesn't delete any messages--it only marks
them in your e-mail client--so you'll never lose any mail. SpamSieve works
with any number of mail accounts, of whatever types are supported by your
e-mail software (e.g. POP, IMAP, Hotmail, AOL).

Requirements: Mac OS X 10.1 or later
Supports: Emailer, Eudora 5.2, Entourage, Mailsmith, PowerMail
Price: $20 (shareware); free upgrade from 1.0-1.2.2
Download: (http://www.c-command.com/downloads/SpamSieve-1.3.dmg)
More Info: (http://www.c-command.com/spamsieve/)
Contact: Michael Tsai (spamsieve@c-command.com)

New in Version 1.3:

* More resilient to spammers' tricks for obfuscating words.

* Can use e-mail addresses in the system Address Book as a whitelist.
Messages sent from those addresses will never be marked as spam.

* Greatly reduced overall memory usage as well as launch and quit
times.

* Can save false negatives to disk for later reporting to SpamSieve's
developer.

* You can edit the spam and good counts associated with a word,
remove selected words from the corpus, and reset the corpus
entirely.

* Type-ahead navigation in the Corpus window. Type the first few
letters of a word or number to select it (and scroll to it).

* You can hide statistics from before a set date, to better see the
current accuracy and spam reception rate.

* Complete change list available at
(http://www.c-command.com/spamsieve).