Iptables Forward Rule

sudo iptables -I FORWARD -s 194.62.0.0/255.255.0.0 -d 192.168.0.0/255.255.0.0 -j ACCEPT
sudo iptables -I FORWARD -s 192.168.0.0/255.255.0.0 -d 194.62.0.0/255.255.0.0 -j ACCEPT
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sudo iptables -I FORWARD -s 172.16.167.0/255.255.255.0 -d 217.160.16.191 -p tcp -m tcp –dport 25 -j ACCEPT
sudo iptables -I FORWARD -s 172.16.167.0/255.255.255.0 -d 217.77.181.120 -p tcp -m tcp –dport 25 -j ACCEPT