Can anyone cast any light on this strange occurence. Had a complaint from a user that two emails to another user on the same server were delivered 13 days late. I did not believe this at first, but message tracking seemed to confirm it. Looked around for anything odd happening on the day they were sent. Turns out that a large mailstore database was offline at the time the messages were sent. The mailstore for the sender was definitely on line, but the mailstore the recipient mailbox is located on was the one that was offline. So it certainly could not be delivered immediately. But why wait almost 2 weeks? Anything special on the day of delayed delivery? Yes! It was the day we put the latest Microsoft updates on. In fact, it would seem that about the time of delivery the server in question would have been failed over (it is a clustered environment in which machines are failed over as part of the update process). So this would seem to be what finally triggered the delivery. Very odd! Where were the message hiding for the 13 days? And why did it take a failover to tweak them out? Elliot

More here: Strange happening – emails delayed for 13 days

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