Hello, My server is Mandrake 10.1 eth0 is WAN with static IP connected to 512k DSL eth1 is LAN I have already configured NAT, etc.. I want my firewall to allow users to send and recieve mails. I want add the following lines to my iptables : -A INPUT -p tcp -m tcp --sport 110 -j ACCEPT -A INPUT -p tcp -m tcp --dport 110 -j ACCEPT -A INPUT -p tcp -m tcp --sport 25 -j ACCEPT -A INPUT -p tcp -m tcp --dport 25 -j ACCEPT Is it OK ? thanks Varun