A client of mine has email that bounces back to him every once in a while. If he tries resending it, it'll usually go through within 10-15 minutes. It might happen twice in a day or it might only happen once ever 3 weeks. The message is always the same: "error 5.5.0 smtp; 554 message failed". Upon performing an internet search, I've found several error messages similar to this one but not one exactly like it. Does anyone have a clue as to what this means? He is the only person in the company having the issue. They have a replicating server and two caching servers. The replicating server, obviously, is running Exchange.
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