Bounce message

A bounce message, or Delivery Status Notification (DSN) message or, simply, a bounce is an automated electronic mail message from the receiver's mail system, the message tells the sender that the message could not be delivered. The original message is said to have bounced.

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Errors can occur at multiple places in mail delivery. A user may sometimes receive a bounce message from their own mail server, and sometimes from a recipient's mail server. With the rise in forged spam and email viruses, users now frequently receive erroneous bounce messages sent in response to messages they never actually sent.

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