Backscatter Spam
Date Posted: August 01, 2008 01:01 AM
Author: Mel Beckman
Dear Doctor, Over the last few weeks, our users have seen an alarming increase in e-mail bounce messages that claim we are sending spam. The messages have subjects such as "Message rejected as spam" and "Message could not be delivered: policy reject." The thing is, they're definitely from legitimate companies, not spoofed. I immediately suspected some kind of spam-spewing virus on our network, but after a careful check of our intrusion detection system (which is great about flagging illegitimate messages originating from within our network), I find no evidence of a problem. Moreover, the only mail server permitted by our firewall to transmit SMTP (port 25) packets has a detailed log of every message sent, and none of the bounce messages' mail addresses are in the log. Meanwhile, the problem continues, and I'm concerned that our mail server will get blacklisted.

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