[cobalt-users] Flushing a mailbox

["Cobalt" <cobalt@xxxxxxxxxxxx>]

I hope this is not a dumb question:  What is the best way to delete all mail
in a mailbox without using a mail client and deleting each mail one at a
time?  If the mailbox is deleted from /var/spool/mail will it be re-created
when the next email is sent?

I have a guy that is subscribed to two mailing lists and has over 800
messages in his mailbox.  I want to be able to clean it out quickly without
deleting the user account and starting over.

Suggestions?...

Scott