PLANET CS-2001 - Manual (Page 701)

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Step 6. Under Policy > DMZ To WAN, set as below:
（Figure 22-35）
 Select the defined rule for Source Address.
 Select the defined rule for Service.
 Click OK.
（Figure 22-36）
Figure 22-35 A DMZ-to-WAN Policy for Granting Email Access to WAN User
Figure 22-36 A DMZ-to-WAN Policy for Granting Email Access to WAN User Completed