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Bounce message
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<p>A bounce message or just "bounce" is an automated message from an email system, informing the sender of a previous message that the message has not been delivered (or some other delivery problem occurred). The original message is said to have "bounced". </p><p>This feedback may be immediate (some of the causes described here) or, if the sending system can retry, may arrive days later after these retries end. </p><p>More formal terms for bounce message include "Non-Delivery Report" or "Non-Delivery Receipt" (NDR), [Failed] "Delivery Status Notification" (DSN) message, or a "Non-Delivery Notification" (NDN). </p>