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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bounced email

An email message returned to the sender by the receiving mail server. Messages are bounced because the recipient does not have an account on that mail server or the address is misspelled. If file attachments exceed a maximum limit, email can be bounced by either the sending or receiving mail server. Also called a "non-delivery receipt" (NDR), "non-delivery report" (NDR), "non-delivery notification" (NDN) or "delivery status notification" (DSN). See email and backscatter spam.

bounced e-mail

An e-mail message that is returned to the sender by the receiving mail server. Called a "non-delivery receipt" (NDR), "non-delivery report" (NDR), "non-delivery notification" (NDN) or "delivery status notification" (DSN), messages are bounced because the recipient does not have an account on that mail server or the recipient's address is misspelled. E-mail can also be bounced back by either the outgoing or receiving mail server if file attachments exceed a maximum limit. See e-mail and backscatter spam.

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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