I have a mailbox on a linux apache server which I access with cpanel from
windows, the name of the mailbox is mailbox, and I would like to remove all
the mail in the mailbox via a cronjob every day,

I have tried this

0 0 * * * rm /.neomail/mailbox/INBOX.db

0 0 * * * rm /.neomail/mailbox/inbox.db

but no mail has been removed at midnight, or at any time, does anyone know
what I should have placed in the cronjob?