How can I change the SMTP port on a cPanel server?

Login to the Web Host Manager => Service Configuration => Service Manager, you'll find an area there called exim on another port.

From there you can specify the additional port. Also, be sure to add the exception for the additional port in the firewall settings. If you are using Config Server Security and Firewall then you would add the custom port to the TCP IN and TCP OUT settings in the Firewall configuration.

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