We have a SBS 2011. Our system has been configured so that iPhones can collect E-Mails from outside of the network - basically, they connect to the mx (mail01.domain.com) which resolves to the WAN interface of our firewall, which is then forwarded to the exchange. So far so good.
The iPhone users now wish to collect emails from within the network via WiFi. At the moment, they need to use UMTS in order to collect emails and when they are in the office, they would prefer to use the wireless LAN. I assume we need to setup the DNS - but not quite sure what to do.
Many thanks for your help & suggestions.