How do I change my Exim SMTP port from 25?

Question

How can I change the default listening port for Exim? 

Answer

First and foremost, changing the port for Exim to something other than 25 will prevent email from sending and receiving without a smart host. This is how mail servers talk to each other.

Warning: If you block port 25, your server (and your users) will not receive any mail.

You can add an additional port through "WHM / Service Configuration / Service Manager" and find "Exim on another port."

To change the port that Exim starts on, navigate to "WHM / Service Configuration / Exim Configuration Manager." Then, open the "Advanced Editor" and look for "daemon_smtp_ports."