It's doable on 2.4.x with DNAT as far i know eg.
iptables -t nat -A PREROUTING -p tcp -d your_old_mail_server_ip \
        --dport 25 -j DNAT --to your_new_mailserver_ip:25

so upgrading to 2.4.x would be my suggestion.

-- 
Sebastian Bruhn Air2.Net
System Tekniker / System Technichian
Email: [EMAIL PROTECTED]

Today is Setting Orange, the 45th day of Chaos in the YOLD 3168


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