Default email account
From Arch Hosting Wiki
All cPanel accounts will have a default email account. To view this, click the "Email Accounts" page in your cPanel. Then, click the "Default Account" button to filter to it.
Then, click "Check Email" next to your default email account. It will have the same username as your cPanel username.
System messages, cron notifications, and other mails may be sent periodically to this email address. It is good practice to clear it out routinely.