Appendix B. Delivery Status Notification Codes
Even in the best-conceived and best-managed Microsoft Exchange environments, you are bound to have messages that just can’t make it through the system. When a message experiences a fatal error and cannot be delivered, Microsoft Exchange Server 2003 returns a non-delivery report (NDR) to the sender and optionally to an administrator.
As you’ll recall, non-delivery reports are system messages that report the delivery status of a message to the sender. (The structure of NDRs is defined in Request for Comments [RFC] 1893.) They are a subclass of a general message information structure referred to as delivery status notifications (DSNs). An NDR provides a three-digit delivery status notification code, such ...
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