Microsoft KB Archive/230498

= XCON: Message Looping NDR for Newly Created SMTP Custom Recipients =

Article ID: 230498

Article Last Modified on 10/28/2006

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APPLIES TO


 * Microsoft Exchange Server 4.0 Standard Edition
 * Microsoft Exchange Server 5.0 Standard Edition
 * Microsoft Exchange Server 5.5 Standard Edition

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This article was previously published under Q230498



SYMPTOMS
You create a custom recipient (CR) for an SMTP address. After creating the address, you send a test message to the custom recipient and receive a non-delivery report (NDR) because of message looping.



CAUSE
When the message is composed to the recipient, the default address is an SMTP address, and is thus routed to an Internet Mail Service in the organization. The server receiving the message, however, does not have that recipient in the directory because of latency in the replication schedule, and attempts to route on the Distinguished Name (DN) of the custom recipient. This results in the message being passed back to the sending server, which generates a loop, and the message transfer agent (MTA) generates an NDR with the loop detection message.



RESOLUTION
To avoid the problem, allow time for directory replication to occur between the two sites before sending mail to the newly created custom recipient. After replication has occurred, the MTAs in the second site can resolve the custom recipient back to the SMTP address and forward the message onto an Internet Mail Service for final delivery.

Keywords: kbprb KB230498

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