Spam Assassin

Spam Assassin is an automated mail filter installed on mail servers used to identify spam. It checks for spam using a large number of pre-set rules that check the header, body, and sender of all e-mail messages sent to your domain mailbox. Spam Assassin uses a wide range of heuristic algorithms on mail headers and message body text to identify "SPAM" (unsolicited email). Once identified, the mail is tagged as SPAM for later filtering using the user's desktop mail client. Visit the Spam Assassin web site for more information.