On Thu, Oct 28, 2021 at 05:48:31PM +0200, Hans wrote: > Oh, and I forgot to mention or make clear: > > The file /var/mail/myusername does not be reduzed to 0, and as the user > myusername I can not manually delete this file, although (if I am not wrong!), > I should be able to, as it is rw for me. Incorrect. Deleting a file requires write permissions on the directory it's in. The permissions on the file itself are irrelevent.