> Is the above your complete iptables ruleset? Is this ruleset on the mail > > server in question, or on a seperate box? If on a seperate box, is it > > acting as a router, are you doing any NAT? It's all on the same box. It's a complete ruleset except the additional DROP lines which are identical except for different IPs. The modem to the outside world is doing NAT to this box, allowing incoming web and mail. Thanks