Untitled

#Flush of all rules

iptables -F

#permit SSH access

iptables  -A INPUT -p tcp --dport 22 -j ACCEPT

#Permit local traffic

iptables  -A INPUT -p tcp -s 127.0.0.1/8 -j ACCEPT

iptables  -A INPUT -p tcp -s <LOCAL_IP> -j ACCEPT

#Permit access from you workstation

iptables  -A INPUT -p tcp -s <YOUR_CLIENT_IP> -j ACCEPT

#Block all Zimbra ports for incoming traffic

iptables -A INPUT -i eth0 -p tcp -m multiport --dport 25,80,110,143,443,993,995 -j REJECT

#Block all Zimbra outgoing traffic

iptables -A OUTPUT -o eth0 -p tcp --dport 25 -j REJECT