Our Exchange server went down do to a power outage. I brought the server back up. It apparently was still not working properly (Time was wrong on the server, Information Store service did not start automatically) so I rebooted it manually, then it appeared to be 100% operational. One of my users received an email that was a reply to a previous email that he did not receive, so he was missing an email in a chain of emails. We use McAffee's hosted smtp relay service (formerly MxLogic) and it says it forwarded that precise email we are missing to our mail server. I used Exchange 2007 Message Tracking but could not locate the email. 1. Any advice on how to track the email down? I'm afraid other users experienced the same thing but don't realize it. 2. If the Information Store is down when the Transport Service receives the email, what happens to the email? Does it hold it until the Information Store comes back up? Thanks in advance.

I'm really thinking the time setting was the issue. Not sure where the email went though. The date/time was 4/21/2011 10am but the server read 12/7/2010 11:55pm when it came back up. I looked in the users inbox at that time frame but there was no email. Could the time being off cause issues?

The email could take up to 48 hours to appear. If the server wasn't available when the originating server tried to deliver the message, it could be in the remote server's queue. You have no control over that. It may also have been bounced by Exchange at the point of delivery - again you wouldn't know as that isn't logged by default. The wrong time can cause problems with email delivery, but if you correct it then the email should be delivered. Although if the time was well out, then the email could have been rejected on a time out and NDR'd back to the sender. Again you wouldn't always know that had happened. Simon.Simon Butler, Exchange MVP Blog | Exchange Resources | In the UK? Hire Me.