Topic Last Modified: 2010-03-08

The Microsoft Exchange Server 2010 Management Pack for System Center Operations Manager monitors the Windows Application log on computers running Exchange 2010 and generates this alert when the events specified in the following Details table are logged.

To learn more about this alert, in Operations Manager, do one or more of the following:


Product Name


Product Version

14.0 (Exchange 2010)

Event ID


Event Source


Alert Type


Rule Path

Microsoft Exchange Server/Exchange 2010/Common Components/Hub Transport and Edge Transport/Transport

Rule Name

PoisonCount has reached or exceeded the configured poison threshold.


This Warning event indicates that the transport process detected a message that could harm a Microsoft Exchange environment. That message was moved to the poison message queue.

Any message that causes the Microsoft Exchange Transport service to fail during message processing is classified as a poison message. Poison messages are put in the poison message queue. The poison message queue is a special queue that is used to isolate messages that are detected to be potentially harmful to the Microsoft Exchange Server 2010 system after a server failure. For more information, see Understanding Transport Queues.

User Action

No user action is required. However, we recommend that you contact Microsoft Product Support to report the potentially harmful message that Exchange detected. You can contact a Microsoft Support professional by going to the Exchange Server Solutions Center page at the Microsoft Support Web site. From the Exchange Server Solution Center page, click Assisted Support Options and then use one of the assisted support options to contact a Microsoft Support professional.

For More Information

If you are not already doing so, consider running the Exchange tools created to help you analyze and troubleshoot your Exchange environment. These tools can help make sure that your configuration aligns with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. To run these tools, go to the Toolbox node of the Exchange Management Console. To learn more about these tools, see Managing Tools in the Toolbox.