How to add additional SMTP ports

In certain cases, you may need to configure an additional SMTP port for email authentication. This new port will support both STARTTLS and plain text authentication methods, offering more flexibility in email delivery.

Procedure:

1. Log in to WHM.
2. Navigate to the “Service Configuration” section and click on the “Service Manager” option.
   
3. Find the option Exim Mail Server (on another port) and enable it by selecting the corresponding radio button.
4. Set the port to 26 or 587 (as recommended), or add any other custom port like 588 if needed.
   
   
5. Scroll down and click “Save” to apply the changes.
   
   

Important: Ensure that the newly added TCP port is opened in both local and external firewalls to allow inbound traffic to the server.