All of a sudden, on all our servers, we are getting bounced messages back to root. Mail thats always been delivered to root, without errors, is now erroring out. When a msg is sent to root we get two msgs. 1 successful, one failed. We are still running exim 350. All boxes are doing the same thing. This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: Why are messages to email@example.com failing?