Bounce message
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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". 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. 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).
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". 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. 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). Remote-MTA: dns; smtp.store.example [192.0.2.3] Diagnostic-Code: smtp; 550 No such user here is sometimes reported as, e.g., while talking to smtp.store.example [192.0.2.3] >>> RCPT TO: Microsoft DSNs and NDRs in Exchange Server Understanding Bounce Email
Text derived from https://en.wikipedia.org/w/index.php?oldid=1370004051 under CC BY-SA 4.0; modifications have been made.