Allowing sendmail to send through IPCop from orange network

I know it's a long shot, but anyone know how?

[j4mes]

Hi,

I have Apache (1.3.33) on a server (Slackware 10.0, 192.168.1.2) in my orange network (192.168.1.*) protected by IPCop (1.4.2, 192.168.0.1).

It serves fine using port forwarding and external access through green (192.168.0.*), however I am unable to use sendmail from orange through green (required for a form to mail script).

I have confirmed that this is not a script problem (cannot send direct from sendmail or pine either), and I have tried using DMZ pinholes to no avail (perhaps this is where my configuration is wrong?)

To anyone who can suggest a solution I would be very grateful.

James.