Centos IPTables configuration for external firewall

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http://serverfault.com – Current setup Centos which is a Web, Mail (Postfix,Dovecot), FTP Server and Gateway with public ip and private ip (for LAN Gateway). We are planning to implement external firewall box and bring the server to LAN Please guide on configuring IPTables... Unable to receive mail and outgoing mail stays in postfix queue and is sent after delaying... The local ip of the server is iptables -P INPUT DROP iptables -P FORWARD DROP iptables -P OUTPUT DROP # incoming HTTP iptables -A INPUT -i eth0 -p tcp --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 (HowTos)