exim & iptables

[Hal]

I'm using Woody as a firewall with NAT to protect a small network that 
includes a mail and web server on  an unregistered (192.168....) 
network.  I'd like to configure the fw so that it can send mail alerts 
to the users via the mail server on the protected net.  If I set 
exim.conf to preclude all local machine delivery (i.e. force remote 
delivery), the messages don't get delivered (they are "frozen") since a 
MX lookup by the firewall indicates that the firewall's registered 
address is also the mail server's address.  The firewall rules include 
a NAT rule for all smtp traffic to go to the internal server.

Any suggestions on how to tell the firewall to send mail to the 
internal mail server?  Is it an exim or firewall config issue?

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