Hi,

Have the following setup.

IPCOP (1.4.16) box with a Green and a Red zone.

Green Interface: 192.168.1.5
Red Interface: 10.1.1.2

The Red interface (eth1) is directly connected to an ADSL modem.
The Green inferface is connected in to a switch, with multiple PC's and a couple of servers.

Email Server: 192.168.1.34

The problem is I cannot for the life of me get port forwarding of SMTP to work.

DEFAULT IP : 25(SMTP) => 192.168.1.34 : 25(SMTP)

Obviously I can send email out fine as it is from GREEN to RED, but I cannot recieve emails.

Any help is appreciated.

Moved to Linux - Networking.

I didn't think you could port forward to the Green network, this helps protect the green network. You should be running an Orange or DMZ network for your external services, such as SMTP and you should be able to port forward RED->ORANGE.