We have a Windows SBS 2011 Server. We had been running Exchange locally until we decided to move to a hosted Exchange service off-site. Now when we try to setup a Outlook mail client to the new Hosted Exchange, it keeps asking for the username and password and doesn't authenticate. If we change the local machine's NIC DNS address to an outside number instead of the server, it authenticates to the Hosted Exchange Service. Our Autodiscover is working correctly when it looks outside of our network.
Is there a way to tell the SBS to point all mail with XYZ.com address outside of the network instead of the local Exchange where it used to be pointed?