How to update your cPanel Contact Information or receive a notification on reaching your quota limit?
If you want to receive a notification on reaching your disk quota, bandwidth usage limit, reaching email disk quota or want to update your cPanel contact information, follow these steps.
Log into your cPanel account.
In the "Preferences" section.
Click on "Contact Information" Icon.
You should see an input box under the line that says "This is an email address to receive account notifications. This should be a separate email address that is not on your account."
Update your existing email address or add your secondary email address in the second email input box.
Select the contact preferences that you would like to be notified about
Click on the "Save" button.