> I recently installed nail (an open-source mime-compliant version of mail). 
> It expects /var/spool/mail to have 1777 permissions to allow
> a dot-lock to be implemented.  It seems that RedHat has disabled
> dot-locking in mailx.  Questions:

1777 allows any user to make files in /var/spool/mail. Fairly soon on a student
machine you will find /var/spool/mail/.mp3 and the like mysteriously 
appearing.

>  + Does mailx use some other method to prevent interfering updates?

lockf/flock

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