In our exchange 2010 environment when setting up Outlook with one of the mailbox accounts, check name resolves the FQDN of our Client Access Server. We do not want employees/customers to see this information. I have a subdomain whos name record is pointed at the CAS server, so all is great until you hit the "check name" button during setup and it resolves to the FQDN of the server.
exchange.mysite.com turns to EX-CAS01.mysite.local
I am trying to figure out how to keep this from happening because it doesn't look as good, but more importantly for security purposes.