PLANET CS-2001 - Manual (Page 496)

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Step 4. Under Policy > WAN To DMZ, set as below:
（Figure 13-32）
 Select the defined DMZ for Destination Address.
 Select the defined service (Mail_Service_01) for Service.
 Select SMTP for Anti-Spam.
 Click OK.
（Figure 13-33）
Figure 13-32 Creating a WAN to DMZ Policy with Service and SMTP Anti-Spam