PLANET CS-2001 - Manual (Page 475)

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Step 6. Under Policy > WAN to DMZ, set as below:
（Figure 13-8）
 Select the defined rule from the Destination Address drop-down list.
 Select the defined service group (Mail_Service_01) from the Service
drop-down list.
 Tick POP3 for Anti-Spam.
 Click OK.
（Figure 13-9）
Figure 13-8 Creating a WAN To DMZ Policy with Service and POP3 Anti-Spam