PLANET CS-2001 - Manual (Page 445)

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12.3 Mail Relay
12.3.1 Using CS-2001 as a Gateway (Set the Mail Server in
DMZ under Transparent Mode)
Prerequisite Setup
Configure Port1 as LAN1 (192.168.1.1, NAT/Routing Mode) and connect it to the
LAN which is using the IP range 192.168.1.X/24.
Configure Port2 as WAN1(61.11.11.11) and connect it to the ADSL Termination Unit
Remote (ATUR) to access the Internet.
Configure Port3 as DMZ1 (Transparent Routing) and connect it to the mail server. IP
address: 61.11.11.12.
Map the registered domain name “supportplanet.com.tw” (used here only as an
example) to the mail server IP address by creating a MX record.
In order to relay emails to recipients in supportplanet.com.tw, refer to the steps below
to configure:
Step 1. Go to Mail Security > Configuration > Mail Domains and then set as
below: （Figure 12-34）
Figure 12-34 Mail Domain Settings