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Non-delivery reports (NDRs) are system messages that report the delivery status of a message to the sender. The messages are a subclass of a general message information structure that is referred to as delivery status notifications. Delivery status notifications describe three....Read More
Request for Comments (RFC) 1893 provides an enhanced set of status codes for Delivery Status Notification (DSN) messages. This is an extension of the coding defined in RFC 821. The error codes in RFC 821 are designed to deal with messaging, and are not as useful for DSN messages.... Read More
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