DSN (“Delivery Service Notification” or “bounce” message)

DSN (aka “Delivery Service Notification” or “bounce” message)

Once a mail server has accepted a message for delivery and cannot deliver the message to its final destination, it MUST generate a non-delivery report DSN to notify the sender that the message could not be delivered.

This can cause problems when a mail server accepts forged messages – see also backscatter.

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