If, when using your email, you come across a warning or error message along the lines of "This address is not secure/SSL encryption is not enabled", follow this guide to secure the affected email.
Navigate to cPanel
Select the "SSL/TLS status" option under "Security".

This will take you to a list of addresses associated with that domain, as well as showing which addresses are secured. Find the email with AutoSSL certification disable, check the box next to it, and click "Run AutoSSL".

Your email is now secured.
