Fix incorrect mailbox quota in cPanel

From time to time, there may be a case where cPanel is showing an incorrect quota used.

This is usually due to the maildirsize file for the email accounts not being updated.

To resolve this, access the server/account via SSH and type the following command:

/usr/local/cpanel/scripts/generate_maildirsize --confirm CPUSER

Please note that "CPUSER" in the following examples must be replaced with the cPanel account username of the account in question.