We have three Exchange 2003 SP2 servers in our organization, one front-end, two back-end. We took the second back end server offline some time ago with plans to use it again in the future. While the second back end server has been offline, I've noticed that several messages a day will be stuck in one of the mail queues, it's a system message of some kind. Anyway, the message is addressed to all of the Exchange servers. At first I was alarmed, but it didn't impact anything, mail flow was fine. My assumption is that since the message was addressed to the offline Exchange server, it would just sit there and expire, which it does. I'd say there will be a dozen or so a week, but they expire.
So, can anyone tell me what these messages are and is there any importance to them?