MailScanner is already a highly-respected open source e-mail security system, with more users than AOL and Hotmail combined, and this new release increases its stability and performance. It processes 500 million e-mail messages every day, removing 2 million viruses and identifying 75 million spam messages.
MailScanner is used at 20,000 sites around the world protecting top government departments,
...Licence : GPL 
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