You receive a "Success" response when using the Test-Mailflow command on an invalid or nonexistent external email address in an Exchange Server 2007 environment


You perform a monitoring latency test on an external email address by using the Test-Mailflow command on a Microsoft Exchange Server 2007 server. In this situation, the command returns a Success response for this test if the external email address is invalid or nonexistent. 


This issue occurs because a relayed delivery status notification (DSN) is treated as a positive DSN in Exchange Server 2007.


To resolve this issue, install the following update rollup:
2407025 Description of Update Rollup 2 for Exchange Server 2007 Service Pack 3


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

For more information about the Test-Mailflow command, visit the following Microsoft website:

Article ID: 2362371 - Last Review: Dec 14, 2010 - Revision: 1