Spam Blackout 

Blocks Spam from your Inbox. Spam Blackout is safe and easy-to-use. Powerful Spam Filtering Engine. Works with Any Email Client Program e.g. Ms Outlook etc. Downloads from Hotmail, POP3 & IMAP. The Email Viewer is Virus Proof.
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TZ Anti Spam Filter 

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

PlexMailer is an anti-spam software. It supports POP3, IMAP, LDAP, NNTP and MBOX protocols. It comes with dozens of filters such as Bayesian and realtime blacklists. Also, it supports server side options and integration with other products.
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