Introduction
You may have requirements to add an additional SMTP port for authentication. This port will allow both STARTTLS and plain text authentication.
Procedure
- Access WHM as the root user.
- Navigate to "Home / Service Configuration / Service Manager"
- Locate the entry for "Exim Mail Server (on another port)"
- Fill in the text box for the port you wish to use and check the box for "Enabled."
- Scroll to the bottom of the page and select "Save" to commit the changes.
Please note that if the server has a firewall that blocks communication by default, the port you use here will need to be opened before it can be used.
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