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I want to do following things: If recipient address not exist in exchange ,redirect to If recipient address meet specific pattern , redirect to Thank in advance!

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You're going to have to implement an SMTP transport event sink (see 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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