PLANET CS-2001 - Manual (Page 698)

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24.1.6 Creating a Policy to Enable LAN / WAN Users to Have
Email Access (A Transparent Mode Example)
Step 1. Set up a mail server in DMZ. Next, point it to the external DNS server and
then set its IP address to 61.11.11.12.
Step 2. Under Policy Object > Address > DMZ, set as below:
（Figure 22-29）
Figure 22-29 Mail Server Settings in Address
Step 3. Under Policy Object > Service > Group, set as below:
（Figure 22-30）
Figure 22-30 A Group Service with DNS, POP3 and SMTP Services