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 From:  Lee Sharp <leesharp at hal dash pc dot org>
 To:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] Hello all - new here
 Date:  Tue, 18 Sep 2007 15:37:03 -0500
Wells, Markus wrote:
>  I just wanted to say hello and that I really dig monowall. It a great
> firewall..
>  I do have a quick question - 
>  We have a mail server behind monowall and we want it's traffic to
> appear to come from a different WAN ip than the rest of our natted
> traffic. We already have a proxy arp entry for the ip in question, I
> just need to know what kind of rule to put in place so that the traffic
> from the mail server and ONLY from the mail server is natted through
> this other ip. 

Server NAT is the easiest way to go.  You will have to define firewall 
rules as well.