I recently clean installed on of my clients SBS 2008 boxes as I had a problem with one of the hard disks and generally it needed a good clear out.
Since we are back up and the server is fully patched I am getting a strange thing where the clients when sending to each other used to use firstname.lastname@example.org and this would get through to the internal mailboxes without problems. Since the re-install if they do that they get an error like this:
"The recipient's e-mail address was not found in the recipient's e-mail system. Microsoft Exchange will not try to redeliver this message for you. Please check the e-mail address and try resending this message, or provide the following diagnostic text to your system administrator."
If the user's external email is Julie@xyz.co.uk if another user on the domain puts in just "Julie" as the To address it gets through, if they put "Julie@xyz.co.uk" they get the error above?
Is this some sort of DNS issue in Exchange or the SBS box? I ran the "Fix My Network" wizard and it identified that IPV6 wasn't configured on the network adapter and I fixed that but I can't imagine that would be the cause of the issue, We also seem to be having an issue with autocomplete entries being remembered in a session where you create them and then being lost when you close out of Outlook could these two things be related?