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Diverting smtp traffic



Hello All

I have an old e-mail server that is still accepting e-mail for some 
domains.  The MX records for these domains are controlled by 
other parties and getting them changed would be a bit of a mission.

At the moment this server forwards all e-mail to my new e-mail 
server.  However in the process I loose some control.  Particularly 
the anti-spam, anti-virus configurations etc are not on the old server.

What I would like to do is forward all TCP traffic on port 25 on the 
old server directly to the new one.  I have tried  "ipmasqadm --
portfw" but there is no masquerading involved and it does not work. 
 I could also user "redir" or "xinetd" but these will hide the 
originating server IP address from the receiving server.  That would 
mess up RBL controls and may even open up an open relay!

Has anybody done this before?  The machine is running potato with 
a 2.2.19 kernel.

Thanks

Ian

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Ian Forbes ZSD
http://www.zsd.co.za
Office: +27 21 683-1388  Fax: +27 21 674-1106
Snail Mail: P.O. Box 46827, Glosderry, 7702, South Africa
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