A non-expirable message with the Internal Message ID %1 could not be categorized. This message may be a journal report or ...

A non-expirable message with the Internal Message ID %1 could not be categorized. This message may be a journal report or other system message. The message will remain in the queue until administrative action is taken to resolve the error. Other messages may also have encountered this error. To further diagnose the error, use the Queue Viewer or the Exchange Mail Flow Troubleshooter.