cPanel account normally comes packaged with mail server and the Mail Exchanger or MX record for the account's domain is set to the cPanel's host. You need to change the MX record for your domain if you want to use third-party email provider such as Gmail or your own self-hosted solution for your configured domain.
You can configure MX records for your third-party mail server in cPanel by deleting existing records and adding new ones.
Make sure nameserver option for your domain is already set to your cPanel's host
Priority is an integer value where mail server with lower priority value will be preferred over the one with higher priority value if you have multiple MX records.
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