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A transport extensibility agent registered on the OnSubmittedMessage event did not handle an exception


Topic Last Modified: 2007-11-16

The Microsoft Exchange Server 2007 Management Pack for Microsoft Operations Manager (MOM) monitors the Windows Application log on computers that are running Exchange Server 2007 and generates this alert when the event or events specified in the following Details table are logged.

To learn more about this event, do one or more of the following:

  • Review the description of the event that includes the variables specific to your environment. From the MOM Operator Console, select this alert, and then click the Properties tab.

  • Review all events that have been logged that meet the criteria of this MOM alert. From the MOM Operator Console, click the Events tab, and then double-click the event in the list for which you want to review the event description.


Product Name


Product Version

8.0 (Exchange Server 2007)

Event ID


Event Source


Alert Type

Critical Error

MOM Rule Path

Microsoft Exchange Server/Exchange 2007/Common Components/Hub Transport and Edge Transport/Transport

MOM Rule Name

A transport extensibility agent registered on the OnSubmittedMessage event did not handle an exception.

This Error event indicates that the transport agent specified in the event description threw an unhandled exception when it tried to process a message. The first time that a message triggers this exception, the Microsoft® Exchange Transport service will crash. If the message is processed again and causes the same unhandled exception, the message is moved to the poison message queue.

The poison message queue is a persistent queue that isolates messages that are detected as potentially fatal to a computer that is running Microsoft Exchange Server 2007. This queue is typically empty. If no such messages exist in the poison message queue, the queue does not appear in the queue viewing interfaces.

To resolve this error, follow these steps:

  • Review the event description to identify the transport agent that triggered the unhandled exception.

  • If the transport agent is written by Microsoft, contact Microsoft Product Support Services. For more information about how to contact support, visit the Microsoft Help and Support Web site.

  • If the transport agent is not written by Microsoft, contact the software vendor who provided the transport agent.

  • If the message was transferred to the poison message queue, we recommend that you contact Microsoft Product Support to report the potentially harmful message that Exchange detected. For more information about how to contact support, visit the Microsoft Help and Support Web site.

Note   Do not delete the poison message from the Poison Message queue. Microsoft Product Support Services may have to examine the message.

To search the Microsoft Knowledge Base articles based on criteria that generated this alert, visit the Search the Support Knowledge Base (KB) Web site.

To review Exchange 2007 event message articles that may not be represented by Exchange 2007 MOM alerts, see the Events and Errors Message Center.

If you are not already doing so, consider running the tools that Microsoft Exchange offers to help administrators analyze and troubleshoot their Exchange environment. These tools can help you make sure that your configuration is in line with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. Go to the Toolbox node of the Exchange Management Console to run these tools now. For more information about these tools, see Toolbox in the Exchange Server 2007 Help.

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