PLANET CS-2001 - Manual (Page 699)

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Step 4. Under Policy > WAN To DMZ, set as below:
（Figure 22-31）
 Select the defined DMZ rule for Destination Address.
 Select the defined service for Service.
 Click OK.
（Figure 22-32）
Figure 22-31 A WAN-to-DMZ Policy for Granting Email Access to WAN Users
Figure 22-32 A WAN-to-DMZ Policy for Granting Email Access to WAN Users Completed