IP Nat / IP chains

[Jonathan Peers <jonathanp@xxxxxxxx>]

Hi all 

I have a mail server on the inside of an ipchains machine. I can sendmail
(25) to it if I setup up sendmail to forward mail (on ipchains)  to the
inside mail server, but how do I pop mail off the inside mail server.

What software would I use or how can I get ipchains to tell my port 110
request to that legal IP number to collect it of the inside mail server, or
if I send mail to that legal number it redirect it to the server on the
inside without me having to setup sendmail and mailertables.


Thank You
Jonathan