Microsoft KB Archive/140934

= XFOR: IMC: NDR is Held Until Timeout Period Expired =

Article ID: 140934

Article Last Modified on 10/28/2006

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APPLIES TO


 * Microsoft Exchange Server 4.0 Standard Edition

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This article was previously published under Q140934



SYMPTOMS
If you send a message to multiple SMTP users, you may not receive Non- Delivery Receipts (NDRs) until the timeout period for the message transfer has elapsed. This only occurs if one of the recipients cannot be reached because their mail host is down and another recipient has an incorrect address.



CAUSE
The Microsoft Exchange Internet Mail Connector (IMC) holds all NDRs until it has exhausted all connection attempts so it can deliver only one NDR per message to the sender.



STATUS
Microsoft has confirmed this to be a problem in Microsoft Exchange Server version 4.0. This problem was corrected in Microsoft Exchange Server 4.0 U.S. Service Pack 2. For information on obtaining the service pack, query on the following word in the Microsoft Knowledge Base (without the spaces):

S E R V P A C K

The IMC will now return an NDR for the invalid recipient (the one with the incorrect address) before the message times out. Under normal operating conditions, the NDR for misspelled domains would be generated within a minute or two after the first attempt to deliver fails. If the IMC has a heavy load of messages to many different domains, it may be longer. The time for generating the NDR and submitting to the Microsoft Exchange Information Store (IS) will be the same as if you returned a message from the IMC's Queue page.

Keywords: kbusage KB140934

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