IPTABLES help

[Bruno Wolff III]

On Mon, Mar 23, 2009 at 14:55:11 +0530,
  Arun Shrimali <arun.reso at gmail.com> wrote:
> On Fri, Mar 20, 2009 at 1:12 PM, Arun Shrimali <arun.reso at gmail.com> wrote:
> >
> > Now my LAN clients (all are having static IPs) want to access mails
> > through outlook express.
> >
> > Please, advice me, how to set iptables chains on linux machine. I
> > don't want to use MASQUERAD other wise user would be able to access
> > Internet directly and squid would be of no use.
> >
> > Can anyone provide me a simple solution.
> 
> Can any IPTABLES expert help me to route pop3, SMTP and IMAP traffic ???

The Fedora list isn't really the place to ask this question. Netfilter
lists would be more appropiate.

A simple solution would be to just forward connections to the few ports
that you want to allow and block the rest (that would require forwarding).