XCON: You Receive a Non-Delivery Receipt When You Send a Message to an MSMail Recipient (813748)

IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry

SYMPTOMS

When you send a message from your Exchange 5.5 Server computer to an MSMail recipient, you may receive a Non-Delivery Receipt (NDR) that is similar to the following:

The following recipient(s) could not be reached: User_Name - 055SAO00 on datetime
The recipient could not be processed due to congestion in the message transfer service MSEXCH:MSExchangeMTA:ACNUSSCH:ACNILMSX02
User_Name (091ACN08) on datetime
The recipient could not be processed due to congestion in the message transfer service MSEXCH:MSExchangeMTA:ACNUSSCH:ACNILMSX02

However, you can send messages to and receive messages from other Exchange 5.5 Server users.

CAUSE

This issue may occur when you move mail from another mail server to this Exchange server, and then replay the mail. This issue occurs if mail is backed up on the bridgehead server so that it cannot replay and handle incoming mail at the same time.

RESOLUTION

WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk. To resolve this issue, edit the registry on the bridgehead server to reset the Dispatch remote MTA messages value to 0, and then stop and restart the Message Transfer Agent (MTA) service:

Click Start, and then click Run.
In the Open box, type regedit, and then click OK.
Click the following registry key:
HKEY_LOCAL _MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeMTA\Parameters
Click Parameters, and then double-click Dispatch remote MTA messages in the right pane.
In the Value data box, delete the current value, type 0, and then click OK.
Quit Registry Editor.
In Administrative Tools, click Services.
Right-click Microsoft Exchange Message Transfer Agent, and then click Stop.
After the service stops, right-click Microsoft Exchange Message Transfer Agent, and then click Start