> > Today I got this in the report from amanda. In this mail server we
> > use mbox and the user just deleted some mails.
> 
> But, wasn't this just a one-time thing that only happened
> because "jondoe" happened to be deleting mail at exactly 

That would depend on the load of the mail server. From experience I
see that several times a week with 200 users, some working late at
night (when backup runs).

Go for maildir mailboxes and the problem will disappear :))

Olivier