Spamihilator 0.9.9 - Free!

[Hawk]

Another little cool proggy for you members that can't stand all the Spam coming into your e-mail box.
Spamihilator (http://www.spamihilator.com/)
Spamihilator works between your E-Mail client and the Internet and examines every incoming E-Mail. Useless spam mails (Junk) will be filtered out. This process runs completely in the background.

[kryyst]

Another good one, and one that I've been using at work is Spambayes. It functions in two modes there is a pluggin for Outlook (only outlook) or it works as a proxy spam filter between any mail program and the internet.

At home I just use thunderbird, it's built in spam filters work very well.