Purgy 

Anti-spam software for Windows. It accepts emails from senders you trust while asking unknown senders to verify themselves by replying to an email. After positive verification it adds them to your approved sender list and delivers all their messages.
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Ad Nuker Popup Blocker & Spam Filter 

Filter Junk E-Mail Spam, Ads, Pop Ups advertising, Viruses, Tojans & Spyware. Works with POP3 & IMAP. This FREE tool uses intelligent filtering of annoying Popup ads, e-mail spam, Spyware, Adware, Trojans, Viruses, Spyware Cookies and much much more
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WorkgroupMail Mail Server 

WorkgroupMail is a full featured mail server, which can provide any size organization with secure and dependable messaging.
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@Spam - Clientele Email Privacy Solutions! 

Take Control over Spam Mails in MS Outlook with @Spam's Next Generation Spam Filter Technology & User Defined Filters! @Spam's Robust Multi-Filter System verifies and quarantines the Spam & Junk mails, providing the user a Spam Free In-box.
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