If you want to receive a notification on reaching your disk quota, bandwidth usage limit, reaching email disk quota, or wish to update your cPanel contact information, follow these steps.
Log into your cPanel account.
In the Preferences
section, click on Contact Information
You should see an input box below the line that says, Enter an email address to receive account notifications and password reset confirmations.
Update your existing email address or add your secondary email address in the second email input box.
Click on the Save