Firewall and SMTP

All,

I am in need of some firewall help in getting mail from an internal mail
server to be sent through the firewall without the need to add any mail
server into the firewall script. I am using ipchains for my firewall. I
would also like to set the firewall up to let all mail server in and out so
that I can stop adding mail server into my firewall script.


Thanx

Justin