Im hoping you can help. I am in the midst of a migration/upgrade and now need a little bit of advice to make sure Im in a good position.
I have/had Exchange 2010, 2 server (1 x Hub, 1 x CAS/MBX), I also have Exchange 2013 2 Servers (both roles, DAG etc). I have a placed a LB in front of the Exchange 2013 servers, which is working fine.
I have configured all of the Internal/External URLs etc to be the same, certificates are fine. End users Outlook is controlled via GPO to use HTTP etc, and all working fine at that end.
Today, I cut over the namespace. Amended internal DNS records to point to the LB, changed the firewall so that the LB IP address was being nat'd etc, and Im in a position where email flows inbound and outbound, and the Exch 2013 servers are proxying requests for mailboxes still on Exch 2010.
However.... I have a Send Connector that points to a Smart Host, that includes the original Exch 2010 Hub server (and both Exch 2013 servers) If I try to take out the Exch 2010 server from it, I cannot send outbound emails. I also know that outbound email is flowing through it and not the 2013 servers, as Exclaimer signature software runs on it, and is displayed on emails even when the users mailbox resides on the Exch 2013 servers.
The External IP address is allowed on the Smart Host portal, as in fact its the same one I used previously.
So as it stands all is working, and I can now phase my migration of mailboxes across to Exch 2013, but once I need to take the old 2010 Hub server out, I'm guessing it will fail again.
Am I missing something here. I would of thought that I would be flowing out of Exch 2013 servers now?
Thanks in advance