ZyXEL Communications P-2612HW-F1 User Manual page 67

Chapter 4 Tutorials
Click the Add button to configure a firewall rule to allow traffic from the WAN to
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the mail server.
Select Any in the Destination Address List box and click Delete.
Select Single Address as the destination address type. Enter "192.168.1.13" and
click Add.
Figure 43 Tutorial Example: Firewall Rule: WAN to LAN Address Edit for Mail Server
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P-2612HW-F1 User's Guide