PLANET CS-2001 - Manual (Page 484)

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Step 4. Go to Policy > WAN to DMZ and then set as below:
（Figure 13-16）
 Select the defined rule from the Destination Address drop-down list.
 Select the defined rule (Mail_Service_01) from the Service drop-down
list.
 Select SMTP for Anti-Spam.
 Click OK.
（Figure 13-17）
Figure 13-16 Creating a WAN to DMZ Policy