Antispam Scanner 

Do you use anti-spam solution but still receive tons of unsolicited e-mails that hurt your business? Antispam Scanner uses a unique algorithm that lets you connect to your mailbox, purge it free from spam and then download only valid messages.
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MDaemon 

MDaemon , Windows-based email server software, contains full mail server functionality and control with a strong emphasis on security to protect your email communication needs. Security features include Greylisting, DKIM, DomainKeys (DK), and SPF.
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SpamBrave for Outlook Express 

SpamBrave is an Outlook Express plug-in that adds intelligent spam filtering functionality. No need to buy an expensive e-mail client with a Bayesian anti-spam filter. From now on, you can train your Outlook Express to filter spam.
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~ 1 SpamItBack 

Get spammers back, and send your own message telling them to stop spamming once, a thousand times, or as many times as you want back to them. And get a hi-score at the same time.
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ORF Enterprise Edition 

ORF Enterprise Edition is an enterprise-level anti-spam solution that helps you to block spam before it reaches your network. ORF uses a combination of anti-spam technologies to stop the spam on SMTP protocol level.
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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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