
Add a NAT policy

Add a reverse policy for inbound mails

Now add a Routing to send the mails from the same IP to avoid RDNS errors

Finally Allow to access the mail Server from Outside via SMTP and HTTP
under Firewall select WAN to LAN and choose these options.
Now you're done .open the http://ping.eu/port-chk/ website and enter u r public ip address to validate the selected ports are opened or not.

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