Accepted IP’s and general information pack:
Source networks (IPv6):
Source networks (IPv4):
Or source networks:
net 184.108.40.206 netmask 255.255.255.192
net 220.127.116.11 netmask 255.255.255.192
net 18.104.22.168 netmask 255.255.255.192
1. Do not leave any other IP’s since they may cause a by-pass route to the email server.
2. In some cases the target email server needs to be configured accordingly.
Source = Source address from the Internet
Destination = Destination address (client-owned)
Protocol = TCP/UDP/ICMP/IP
Service = exact/ANY (preferably a port number)
Action = function (usually accept)