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Misleading NDR When Sending to Remote Domain That Does Not Allow Relay

This article was previously published under Q262354
When you send messages to a remote domain that does not allow relay, you may receive an non-delivery report (NDR) similar to the following:
The following recipient(s) could not be reached: on 1/6/00 7:58 PM

The originator does not have permission to submit message
dns; failed 5.7.1 smtp;550
5.7.1 Unable to relay for
The actual reason for the NDR is that the remote domain has prohibited the sending domain from relaying. The NDR can be misleading because it implies that it is a permissions problem with the sender. The Delivery Status Notification (DSN) error code is defined in Request for Comments (RFC) 1893 as "Delivery not authorized, message refused." For additional information about status codes forDelivery Status Notification (DSN) messages, click the article number below to view the article in the Microsoft Knowledge Base:
256321 XCON: Enhanced Status Codes for Delivery - RFC 1893
This behavior is by design.
xmrp exch2kp2w XCON

Article ID: 262354 - Last Review: 12/03/2007 04:45:00 - Revision: 3.5

Microsoft Exchange Server 2003 Enterprise Edition, Microsoft Exchange Server 2003 Standard Edition, Microsoft Exchange 2000 Server Standard Edition, Microsoft Windows Small Business Server 2003 Premium Edition, Microsoft Windows Small Business Server 2003 Standard Edition

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