I have Unity 5.0(1) with Ex2003. We are doing testing with Exchange server down and brought back up. Whenever Exchange is down and brought back up UnityMTA does not deliver the messages to Exchange but move the files to the Commserver\UnityMTA\Failed folder. However after about 2 minutes if we move the files back into UnityMTA folder it sync correctly. Is there a way to increase the timer that UnityMTA sync with Exchange or increase the number of retries before failing? I see a few registry keys but just need confirmation.