Step 1 – Connect to your pfSense firewall.You should get to the Dashboard as the default page.
You would need to NAT an available public IP address bound to the pfSense firewall via port 25 to the modusGate box, and from there modusGate will transfer clean mail to the internal mail server. Since we’re mainly concerned with our modusGate product, usually you will deploy modusGate on a separate machine from your production mail server. In this case we’re mainly interested with port forwarding because most of the time, admins will NAT a specific port (in this case, SMTP port 25) from a public IP address to an internal IP address. Many small and medium sized businesses use pfSense because of its simplicity and its dual role where it can also act as an SMB router. It can be found on imbedded devices, servers, and as pre-configured virtual machines for various hypervisors. It’s basically a fork of m0n0wall project by Chris Buechler and Scott Ullrich.
PfSense is one of the most popular open-source firewalls available.
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