Login to Sonicwall and select NAT policies under Network options
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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