We have 3 NICs in our BM 3.6 server.
One is Private, one is "DMZ" and one is Public.

If we enable NAT (static or dynamic) on more than one NIC at a time,
loose connection to both of them. For example, we have people
in to one NIC and email on the other. If we enable NAT on both NICs,

outgoing and incoming email goes down and the people cannot connect.

So my question is can you enable NAT on more than one NIC per server?
so, is there anything that is unique with its setup?

Any help is appreciated.