iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT
iptables -F
iptables -X
iptables -t nat -A POSTROUTING -s 172.25.25.0/24 -o eth0 -j MASQUERADE
iptables -A INPUT -i lo -p all -j ACCEPT
iptables -A INPUT -p all -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -A INPUT -i tun+ -j ACCEPT
iptables -A FORWARD -i tun+ -j ACCEPT
iptables -A INPUT -p tcp -m tcp --dport 465 -j ACCEPT
iptables -A INPUT -p tcp -m tcp --dport 110 -j ACCEPT
iptables -A INPUT -p tcp -m tcp --dport 25 -j ACCEPT
iptables -A INPUT -p tcp -m tcp --dport 22 -j ACCEPT
iptables -A INPUT -p udp --dport 8887 -j ACCEPT
iptables -A INPUT -s 172.25.25.0/24 -p all -j ACCEPT
iptables -A FORWARD -d 172.25.25.0/24 -j ACCEPT
iptables -A INPUT -p tcp -m tcp --dport 22 -j ACCEPT
iptables-save > /etc/iptables/iptables.rules
systemctl restart iptables