Sounds similar to my set up, where the zimbra server has a private IP address and the firewall portforwards 25 and 80 to it, allowing access from the rest of the world. I did very little on the zimbra unit to make it all work, I simply put a A and MX record on the windows domain controller DNS on the same lan pointing to the zimbra private IP.
I notice that if the domain controller is offline then mail wont be delivered and the zimbra server cannot resolve it's own IP addresses (happened recently, two drive failiures in a raid 5 in the space of moments, argh!) but that's a problem I can ignore. |