I am new to using WatchGuard devices and was wondering what are the proper policies to setup for an email server (Xeams running on Windows 2008 R2 vm in ESXi)? I setup the standard policies for all the ports (25, 993, 465, 143) and the MX records are ok at the host for the domain. The ports are open per a port scan. The problem I have is when setting up a client like Thunderbird. It fails to connect to the server. I'm sure it is something fairly simple in the configuration that is missing.