Step 4. Go to Policy > WAN to DMZ and then set as below:
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
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(Figure 13-16)