Microsoft KB Archive/930463

= You receive NDR messages for some recipients when you send e-mail messages on an Exchange 2007-based server =

Article ID: 930463

Article Last Modified on 9/13/2007

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APPLIES TO


 * Microsoft Exchange Server 2007 Standard Edition
 * Microsoft Exchange Server 2007 Enterprise Edition

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SYMPTOMS
When you send e-mail messages to some recipients, you receive non-delivery report (NDR) messages for these recipients.

This problem occurs if the following conditions are true:
 * The Microsoft Exchange EdgeSync service is running on a server that is running Microsoft Exchange Server 2007.
 * The Exchange 2007-based server is running the Hub Transport role.
 * The blocked recipients list is configured on the Exchange 2007-based server.
 * The recipients on the blocked recipients list are in a domain that is different from the Hub Transport server. Or, the recipients on the blocked recipients list are in the same domain (is a peer domain of the forest root domain) in which the Hub Transport server is located.

Note The NDR includes the following error message:

550 5.1.1 User unknown

This message indicates that the recipient is not valid. However, the recipient is not on the blocked recipient list.



CAUSE
This problem occurs because the Exchange EdgeSync service synchronizes only objects from the same domain tree. The Exchange EdgeSync service does not synchronize objects from other domain trees in the same forest. Recipients who are located in domains other than the Hub Transport server or outside the root domain tree are treated as unknown users.



RESOLUTION
To resolve this problem, install Update Rollup 4 for Exchange 2007 on the server that is running Exchange Server 2007. For more information about Update Rollup for Exchange 2007, click the following article number to view the article in the Microsoft Knowledge Base:

940006 Description of Update Rollup 4 for Exchange 2007



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
The Exchange EdgeSync service is the data synchronization service that runs on a Hub Transport server. The Exchange EdgeSync service is usually used for anti-spam purposes.

For more information about the Exchange EdgeSync service, visit the following Microsoft TechNet Web site:

http://technet.microsoft.com/en-us/library/fbf3f7c0-de5d-4a2a-b219-5c412a628c29.aspx

You can configure the blocked recipients list in the Exchange 2007 Management Console. To do this, follow these steps:
 * 1) Open the Exchange 2007 Management Console.
 * 2) Click Edge Transport, and then click Anti-Spam.
 * 3) Right-click Recipient Filtering, and then click Properties.
 * 4) Click Blocked Recipients, and then click to select the Block messages sent to recipients not listed in the GAL check box.

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

For more information about the new naming schema for Exchange Server software update packages, click the following article number to view the article in the Microsoft Knowledge Base:

817903 New naming schema for Exchange Server software update packages

Keywords: kbqfe kbexpertiseinter KB930463

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