Troubleshooting Connectivity Problems Between the SonicWall and the Microsoft Exchange Server
In most cases, Exchange Servers are placed on the internal LAN with the rest of their domain. This is the recommended configuration behind a SonicWall. Exchange requires extensive ties between other nodes in the domain, such as the domain controllers, WINS servers, and clients. Getting all of these connections to work properly over any firewall and/or NAT device can represent a serious challenge.