Some e-mail messages become stuck in the submission queue in Exchange Server 2007

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.

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.

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 about Update Rollup 1 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic: To resolve this problem in the release version of Exchange Server 2007, install Update Rollup 6 for Exchange Server 2007. For more information about Update Rollup 6 for Exchange Server 2007, see the following Exchange Help topic: For more information about how to install the latest Exchange service pack or update rollup, see the following Exchange Help topic:

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

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

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