Hullo :) I'd like to do $SUBJECT, but after much playing with commands like iptables -t nat -A PREROUTING -p tcp -i eth1 --dport 25 -j DNAT --to 10.0.0.253:25 I have given up and have come to you fine people for help... My LAN is on eth1, with WAN on eth0. The gateway machine is 10.0.0.254 doing masq for LAN clients, but I'd like to send any outgoing SMTP connections to 10.0.0.253 - alas any time I've tried, I just end up killing ALL outgoing SMTP :( Any suggestions warmly received! Cheers, Gavin.