iptables -A FORWARD -d 0.0.0.0/32 -p tcp –dport 25 -j ACCEPT
iptables -A FORWARD -p tcp –dport 25 -j DROP
/etc/init.d/iptables save
iptables -A FORWARD -d 0.0.0.0/32 -p tcp –dport 25 -j ACCEPT
iptables -A FORWARD -p tcp –dport 25 -j DROP
/etc/init.d/iptables save