NAT / Port forward on second iprange

[falcon]

Hello I am having some issues setting up port forwarding for an ipaddress and a few ports to an internal IP.

basicly we have one ip range that our 2 carp pfsense firewalls are on and a DMZ iprange. I want to use an IP in the DMZ range to port forward port 25 110 to an internal IP. Ive tried a number of things however im unable to connect to those ports.

When setting up the nat or vip do I apply it to the DMZ interface or the wan interface ? and in the firewall rules do I apply the rules to the wan interface or the DMZ interface.