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.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Article ID: 2362371 - Last Review: Dec 14, 2010 - Revision: 1