PLANET BM-2101 - Manual (Page 182)

Use the virtual server instead of many of the internal server which provide the same
services by policy management (For example , use the HTTP , POP3 , SMTP , DNS
service group).
Step1. Sets many LAN server which provide multiple services , its network
adapter IP address are 192.168.1.101 , 192.168.1.102 , 192.168.1.103 ,
192.168.1.104 , and the DNS is correspond to the external DNS server .
Step2. In Address Æ LAN and LAN Group , add the new following setting
The setting of server mapped to name
The LAN server group setting
Step3. In Service Æ Group , group the service. And add the new policy of service
group for the server which can send the mails to external.
Add new service group