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


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:

User@Remotedomain.com on 1/6/00 7:58 PM

The originator does not have permission to submit message
dns;Wsilver.com failed 5.7.1 smtp;550
5.7.1 Unable to relay for User@Remotedomain.com


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.

Artikelnummer: 262354 – Letzte Überarbeitung: 02.12.2007 – Revision: 1