Hi, I want to allow my internal network to only connect to some specific email servers. Apart from these mail server I want to block port 25 and 110 from my internal network to anywhwere. I am doing the following : iptables -I INPUT -I eth0 --dport 25 -d !<ip addr of mail server> -j REJECT This does not seem to block the port 25 traffic. Where am I going wrong? Kindly help. Regards, Vijay Kumar
