IPTABLES mail forwarding ?

From: TCF Cranendonk (t.cranendonk@home.net)
Date: 03/14/02

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    Date: Thu, 14 Mar 2002 17:34:37 +0100
From: TCF Cranendonk <t.cranendonk@home.net>

    Hi,

    I have a firewal running on my fixed ip address and closed most ports.
    everything works fine. However I want to forward smtp to another
    server on the local net 192....

    I have added the following:

    iptables -t nat -A PREROUTING -p tcp --dport 25 -i $ext_if -j DNAT
    --to-destination 192.xxx.xxx.xxx

    It doesn't work though, because when I telnet to port 25 I reach the
    gateway and not the server.
    I also need some help with input and output rules for smtp.

    Thanks is advance

    Theodor.

    ps.
    I am running SUSE 7.3

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