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CatchAllAgent is an Exchange 2007 Transport Protocol Agent. If a message comes in, and a recipient of that message does not exist (unknown recipient), the recipient typically gets rejected by the Recipient Filtering feature (which is also a Transport Protocol Agent). The CatchAllAgent can be configured to rewrite the recipient address for unknown recipients such [...]

Microsoft has a very cool Exchange connectivity analyzer. It’s web-based and free! You can use it for testing ActiveSync, Exchange Web Services, Outlook connectivity and e-mail tests. Give it a try and find out if your setup works as it should.