Topic Last Modified: 2010-09-15

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

MSExchange Store Driver

Alert Type


Rule Path

Microsoft Exchange Server/Exchange 2010/Hub Transport/Store Driver

Rule Name

There are too many mail submission threads on this server.


This Warning event indicates that there are too many RPC mail submission threads on this Microsoft Exchange server. This warning may indicate that you should modify settings on the server. The maximum number of threads that the Microsoft Exchange Exchange Transport Service can use for submissions is defined by the MaxConcurrentMailboxSubmissions attribute. The default value is 20 multiplied by the number of processors that are on the server.

User Action

To resolve this error, make sure that the server is not overloaded. If the server is overloaded, use one or more of the following methods:

  • Change the mail submissions thread value MaxConcurrentMailboxSubmissions by using the Set-TransportServer cmdlet.

  • Consider making other changes in the Exchange environment that could decrease the load on the servers.

  • For more information about message throttling options in Exchange, see Understanding Message Throttling.

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.