Configuring Exim to run on another port

Issue :

Port 25 blocked is blocked by ISPs. How to add an alternate port ?

Fix :

Assuming that you want to use , say , port 666.
Put the following line in the first text box in Advanced Exim Editor :

daemon_smtp_ports = 25 : 666

OR

Go to WHM >> Service Configuration >> Service Manager and check the check-box for “exim on another port.”