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Article ID: 238498 - Last Review: October 21, 2013 - Revision: 4.2

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The information store generates a non-delivery report (NDR) to an SMTP report when an SMTP report is returned to a mailbox that meets all of the following conditions:
  • The mailbox size currently exceeds the set limit.
  • The Prohibit send and receive (K) option is selected.
  • The Internet Mail Service is on a server different from the mailbox.
This could cause a message loop as the report is addressed to a null (<>) address, which means the Internet Mail Service cannot deliver the message. At this point, the NDR is returned to the originator, which was the mailbox currently unable to accept mail. This may generate yet another NDR, and the whole process repeat itself.


To resolve this problem, obtain the latest service pack for Exchange Server 5.5. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
191014  ( ) How to Obtain the Latest Exchange
The following files are available for download from the Microsoft Download Center:
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Download Q248838engi.exe now (

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Download Q248838enga.exe now (
For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base:
119591  ( ) How to Obtain Microsoft Support Files from Online Services
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help to prevent any unauthorized changes to the file.


Microsoft has confirmed that this is a problem in Microsoft Exchange Server Version 5.5. This problem was first corrected in Exchange Server 5.5 Service Pack 4.

  • Microsoft Exchange Server 5.5 Standard Edition
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