bounce message

A notification message returned to the sender by a site unable to relay e-mail to the intended recipient or the next link in a bang path. Reasons might include a nonexistent or misspelled user name or a down relay site. Bounce messages can themselves fail, with occasionally ugly results; see sorcerer's apprentice mode and software laser. The terms "bounce mail" and "barfmail" are also common.

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When an NDR message is received by the Barracuda Spam Firewall, a valid tag must be present in bounce recipient address (i.e., the original sender address) for the bounce message to be delivered.

New invalid bounce suppression feature

Victor Janulaitis said, "We have decided to publicly publish a list of frequently spamming domains hoping that this will put pressure on those domains that are listed." Janulaitis added, "We hope that more businesses and individuals will begin to add domain filters and bounce messages back to those site."

Spam Domain List Published by Janco

* Top subject lines used by spammers included "Delivery Status Notification (Failure)", "Return mail" and "Undelivered Mail Returned to Sender", correlating with the use of NDR or bounce messages as a spam vector, but new malware related subject lines also emerged, such as "Notice of Underreported Income" and "Thank you for setting the order No.475456