Mail Storage Guard 

Mail Storage Guard is an extension for Microsoft Exchange Server 2000/2003 and IIS SMTP servers, designed to protect your server from spam, prevents mail relaying, mail-bomb and NDR attacks. Works at SMTP and at storage levels.
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SpamSource 

SpamSource is an addin for Microsoft Outlook 2000/XP/2003. SpamSource helps collect information from messages for use in reporting unsolicited junk email.
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IPS Spam Filter 

The progam runs in the background and catches 99% of the spam messages. All Spam E-mails are removed from your e-mail box and stored at a special place where you can review.
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