Source: GroupWise Message Transfer Agent.
Explanation: The MTA has lost its connection to a post office with which is could previously communicate.
Possible Cause: The server where the post office is located is currently down.
Action: Wait for the server to come back up, or contact the administrator of that server.
Possible Cause: If using TCP/IP communication between post offices, TCP/IP might be down.
Action: Make sure TCP/IP is running on the servers where the post offices are located.