User manual

Firewall
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Enter smtp in Other TCP Ports. This is the protocol remote clients use for sending mail
via the server.
Click Finish.
Click NAT, the Port Forwarding tab, then New.
Click Advanced at the bottom of the page.
Enter Mail server In Descriptive Name.
Leave Enable and Create Packet Filter Rule checked.
Leave Incoming Interface and Source Address as Any.
Select your Internet connection in Destination Address.
Click Predefined next to Services.