From mboxrd@z Thu Jan  1 00:00:00 1970
From: Gavin Hamill <gdh@acentral.co.uk>
Subject: Re: Redirecting outgoing SMTP from LAN to another LAN server
Date: Fri, 30 Apr 2004 13:28:09 +0100
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References: <20040429095949.GB22172@acentral.co.uk> <20040429133757.GK7147@samad.com.au> <20040429144757.GA6534@zion.homelinux.com>
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On Thursday 29 April 2004 15:47, Sven Schuster wrote:

>
> iptables -t nat -A POSTROUTING -p tcp -i eth1 -s 10.0.0.0/8 \
>    -d 10.0.0.253 --dport 25 -j SNAT --to 10.0.0.xx:25
>
> where xx would be the ip of your firewall. Now both the packets
> from the client to the server and the returning packets from the
> server to the client will travel through your firewall.

Thanks for the reply - the explanation sounds right, and I think I understand 
what's going on now - I won't be able to test the theory out until next week 
- I just didn't want to seem rude by staying silent to date :)

Cheers,
Gavin.