CleanMail Server

From byteplant:

CleanMail is a SMTP or POP3 e-mail security solution (anti-spam or anti-virus) that integrates into existing email environments. CleanMail includes a comprehensive set of filters, including an attachment blocker, remote blacklist filter (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. CleanMail also supports anti-virus software packages by many 3rd party vendors.

With CleanMail you have online access to view real-time statistics charts and reports using a web browser, or using the CleanMail Admin application. Data available online includes spam statistics, mail logs (a listing of mails received, including subject, sender and recipient address), and a ranking of spam hosts (hosts submitting spam mails in the last 24 hours).