>
> /var/spool/mail is root.wheel rwxr-xr-x
> each mailbox is owned by its user (f.e. draco.users rw-------).
> correct?
>
smail or sendmail run as root/mail, so set the spooling and log directories
concerning mail to root/mail and the mailboxes themselves to <user>/mail.
At least this works fine for me.
Regards,
Torsten