I've been alerted to a problem, that's so weird I'm posting before I've begun troubleshooting.
An email was sent from one mailbox to external recipients, with several in house mailboxes copied on the msg via a distribution list.
The Email appears to have been re-sent 40 odd minutes later but from a different internal mailbox, I believe the user was offline at the time.
The two users do not have any shared mailbox privileges, no send on behalf or full mailbox access.
I'm going to track the msg via msg I'D but wanted to ask for any advice on how to troubleshoot This?
The company use an external smtp relay server, so I'll be able to track the messages through that system as well.