In a Microsoft Exchange Server 2007 environment, some e-mail messages become stuck in the submission queue and take a long time to be delivered.

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This problem occurs when these e-mail messages are sent to nested distribution groups. The expansion server takes a long time to process nested distribution groups. These e-mail messages are sent to large nested distribution lists together with permission groups for user rights to send messages to the distribution lists.

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To resolve this problem in Exchange Server 2007 Service Pack 1, install Update Rollup 1 for Exchange Server 2007 Service Pack 1. For more information, click the following article number to view the article in the Microsoft Knowledge Base: To resolve this problem in the release version of Exchange Server 2007, install Update Rollup 6 for Exchange Server 2007.
For more information, click the following article number to view the article in the Microsoft Knowledge Base:

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To work around this problem, use a server that is running Microsoft Exchange Server 2003 as the expansion server.

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Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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For more information, click the following article numbers to view the articles in the Microsoft Knowledge Base:

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