clear all mailboxes

[tmpr]

Hello,

I have debian (ISPCONFIG) bulk mailing server and i want clear / delete ALL e-mails from EVERY user, i have a lot bounces and other junk e-mails these have size over 4 gb (!)

How i can delete ALL e-mails from EVERY user in SHORT TIME?

My users e-mail path: /var/vmail/ I think on something like this find /var/vmail// (.. ?? ) but here are a lot request (find).

Thanks!