CleanMail Server Free

CleanMail is a mail filter (anti-spam/anti-virus) that easily integrates into existing email environments. CleanMail includes a comprehensive set of filters, including an attachment blocker, DNSBL, and a complete Windows build of the award-winning, open-source SpamAssassin filter. The open-source ClamWin anti-virus package is available as a fully-integrated, optional download.