Bounce Message

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Bounce Message

A message from a server to an e-mail sender that the e-mail did not reach the recipient. There may be a variety of reasons for a bounce message, ranging from an invalid e-mail address to a full mailbox to a busy server.
References in periodicals archive ?
The threat, announced at Microsoft Tech-Ed 2003 in Dallas, exploits the system's Non-Delivery Report (NDR) feature, enabling outside spammers to hijack servers in order to send out thousands of spam messages without the enterprise's knowledge.
A Reverse Non-Delivery Report (RNDR) attack occurs when the spammer takes advantage of a server's inherent ability to return email that is misaddressed.
This also prevents the non-delivery reports these email would have previously generated.
Since CMS' public warning in June, 2003 that enterprises can be used as unwitting enablers of spam via Reverse Non-Delivery Reports (Reverse NDRs), more companies are finding themselves to be under this surreptitious form of indirect mail relay attack.
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