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I want to do following things: If recipient address not exist in exchange ,redirect to a@test.com If recipient address meet specific pattern , redirect to b@test.com Thank in advance!

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1 Answer 1

You're going to have to implement an SMTP transport event sink (see http://technet.microsoft.com/en-us/library/bb123644(EXCHG.65).aspx for ugly details) to do what you're talking about via pattern matching. Exchange can handle redirecting mail via contact objects (as described in this answer), but to act dynamically (based on pattern matches, for example) you'll have to write code.

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