send mail from linux throught wingate server to isp?
 

i has a wingate server running on WinNT Server that connected to internet and i has a mailserver running Linux Red Hat 6.0.
i want all my mail send out to internet through wingate server.
the wingate server has a smtp proxy service can be set to listen to other mail server that i already configured and on mail server side, i already set the gateway on my mail server to the wngate server IP address.
i seem to be not work at all. i wonder any other setting need to be set or configure beside this?

nick