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backscatter spam

A spam method that relies on mail servers returning messages to the sender. The spammer forges a valid email address in the "From" field of the spam message and makes the "To" address a phony email recipient, but to a real company. Since there is no email account with the phony name, the receiving company's mail server bounces back the message before sending it to the spam filter. As a result, the spam winds up in the inbox of the intended recipient as undelivered mail. Also called "bounce spam" and "reverse non-delivery report spam" (reverse NDR spam). See NDR spam.

NDR spam

(Non-Delivery Report spam) A spam email faked as an undeliverable, returned message. Even people indifferent to these scams may tend to peek at NDR spam if they recently sent someone an important message. See backscatter spam.

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