SpamArrow   
http://www.spamarrow.com

SpamArrow is a simple and stable spam blocker to effectively filter out any unwanted spam emails with near zero false positives. It uses the famous SpamAssassin engine and the Bayesian filtering to automatically classify incoming emails as spam or non-spam. This anti spam software is a great add-on for Outlook and Outlook Express by automatically creating integrated spam-fighting toolbar buttons and a spam folder to collect all emails identified as spam. Unlike most spam filter software products usually do, SpamArrow will never modify your original email message and never add message rules for Outlook or Outlook Express.

SpamBrave for Outlook Express   
http://www.spambrave.com

Bayesian spam filtering plug-in for Outlook Express prevents annoying spam and junk emails from polluting your Inbox. Get only wanted emails in your Inbox and nothing else! Fully supports your Address Book. Allows or blocks email addresses or whole Internet domains you want. Bounces email back to spammers. Auto-delete expired spam emails. Built-in Backup and Restore Wizard. Detailed statistics on the work done.

Spam Bully 3 for Outlook Express   
http://www.spambully.com

Outlook Express Bayesian spam filter intelligently keeps your Inbox spam free. Easy to use toolbar. Allow or block email addresses, IP's, words/phrases you choose. Block spam by country and language. Bounce spam back to spammers. Report spammers to their hosts and the FTC. Forward only good emails to your cellphone. Auto delete spam as it downloads. Send challenge emails to unfamiliar emailers. Comprehensive statistics. Convert the SpamBully toolbar into English, Spanish, French, Italian, German, Russian, and other popular languages. Every feature is fully customizable.

Spam Bully 3 for Outlook   
http://www.spambully.com

Outlook Bayesian spam filter intelligently keeps your Inbox spam free. Easy to use toolbar. Allow or block email addresses, IP's, words/phrases you choose. Block spam by country and language. Bounce spam back to spammers. Report spammers to their hosts and the FTC. Forward only good emails to your cellphone. Auto delete spam as it downloads. Send challenge emails to unfamiliar emailers. Comprehensive statistics. Convert the SpamBully toolbar into English, Spanish, French, Italian, German, Russian, and other popular languages. Every feature is fully customizable.

SpamButcher   
http://www.spambutcher.com

SpamButcher is an advanced anti-spam filter. Its spam blocker can stop 98% of spam. Every few minutes the anti-spam software checks for new messages in your inbox. If it finds any unwanted email, it's moved to a holding area for your later examination. It exhaustively examines the text of each message, where it originated from and other information within the email. SpamButcher even takes into account common tricks used by spammers to sneak past other spam filtering systems. SpamButcher's email filter uses a fuzzy logic expert system to determine which messages are spam, and which aren't. SpamButcher can optionally send you scheduled reports of blocked spam via email. With supported email clients, inadvertently filtered messages can be restored directly from the reports. SpamButcher will work as a spam stopper for Windows users whose mail accounts are accessible via the POP3 protocol. This includes most non-web-based mail accounts. SpamButcher does not work with AOL or Hotmail accounts.