Microsoft KB Archive/924239

= Exchange 2003: Mail queuing in Deferred Delivery =

Article ID: 924239

Article Last Modified on 10/25/2007

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APPLIES TO


 * Microsoft Exchange Server 2003 Enterprise Edition
 * Microsoft Exchange Server 2003 Standard Edition

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Source: Microsoft Support

RAPID PUBLISHING

RAPID PUBLISHING ARTICLES PROVIDE INFORMATION IN RESPONSE TO EMERGING OR UNIQUE TOPICS, AND MAY BE UPDATED AS NEW INFORMATION BECOMES AVAILABLE.



SYMPTOMS
Mail from external sources will queue in the Deferred Delivery Queue.



CAUSE
This can be caused by a loop to an external smart host. If mail comes in for a non-authoritative email domain, and relaying is allowed, the mail will try to route back out to the Internet if the recipient does not exist in the org. If the mail is sent to a smart host that is configured to forward mail to that email domain back into the Exchange Organization, then we will get a loop. The mail will queue in deferred delivery until the loop is removed.



RESOLUTION
To resolve this type of issue add the email domain to the recipient policy, or restrict relaying to force NDR's to be sent properly.



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Keywords: kbprb kbtshoot kbrapidpub KB924239

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