PLANET CS-2001 - Manual (Page 477)

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Step 7. Go to Policy > DMZ to WAN and then set as below:
（Figure 13-10）
 Select the defined group from the Source Address drop-down list.
 Select the defined service group (Mail_Service_02) from the Service
drop-down list.
 Tick POP3 for Anti-Spam.
 Click OK.
（Figure 13-11）