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MIMEDefang, a sendmail milter written by Roaring Penguin Software, filters all e-mail messages sent via SMTP through a sendmail installation, blocking common mail virii, and now -- with the help of [SpamAssassin] -- spam. "You can use [SpamAssassin] to test for spam, and then all of the MIMEDefang goodies to reject, manipulate or otherwise mangle the message." Integrate with the MTA to the level of returning 5xx error codes during the SMTP session, so virii or detected spam can be rejected at the delivery, which notifies the sender, that the mail was rejected, without generating an additional email message.\[http://www.roaringpenguin.com/mimedefang/\]