Spam Nullifier Pro 

Eliminate Junk E-Mail Spam, Viruses, Tojans & Spyware. Works with POP3, IMAP, HTTP. Spam Nullifier is a powerful e-mail checker programs with effective spam elimination. This FREE Anti Spam Filter stops unwanted viruses, trojans & spam e-mails.
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Spam Trapper for Outlook 

Spam Trapper is a multilevel spam filter for Microsoft Outlook version 2000 and later. It is a plug-in component with clear convenient interface.
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SpamWeed Anti-Spam Filter 

A powerful & easy-to-use spam filter that blocks over 95% spam instantly for Outlook, OE & other email clients. Spam are placed in a quarantine area & can be retrieved or deleted. SpamWeed learns from mistakes & its detection rate improves with use.
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Cactus Spam Filter 

Cactus Spam Filter is a free spam blocker. It protects your inbox by learning to detect spam as it's being used. This spam stopper integrates with all e-mail clients that use POP3 such as MS Outlook, MS Outlook Express, Netscape, Opera and Mozilla.
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Out Spam 

Out Spam is a spam filter program. It can remove junk letters from a POP3 mail server without downloading them to a client computer. The principal way to separate mail is the use of worldwide black lists of spam mail servers.
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Extensible Messaging Platform Anti-Spam Filter 

Server based Anti-Spam Filter protects organizational mail servers (Exchange Server, Novell GroupWise, Lotus Domino, Sendmail, etc) from spam, email-borne viruses and objectionable content using contextual pattern signatures (not simple keywords).
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