HI all,
I am new to the community & new to Zimbra too,
I am trying to install the Zimbra in the testing environment before deployment, so I need lot of help.

My scenario is,
Zimbra mail Server Along with DNS should work behind the Firewall/Router
Firewall/Router IP Address, With WAN IP

DNS Server IP Address
Zimbra Mail Server IP Address

Now the question is, how do I configure DNS Server to serve internally as well as Publicly for Mail Domain name resolution.
I am about to configure DNS using Oracle Linux with Bind 9
I know NATing PATing port forwarding concepts & read lot of articles about Split DNS but all of them trying to install DNS on Zimbra Server.
Any Help would be greatly appreciated.