Date: Fri, 1 Jan 1993 00:00:00 -0800

  If "mailgroup" is set, inc is made set-group-id to this group name.
  Some SYS5 systems want this to be set to "mail". Set this if
  /usr/spool/mail (or /usr/mail) is not world-writable. These changes
  were contributed by Peter Marvit, and "inc" is very careful about
  its use of the set-gid privilege.

  Note that slocal doesn't know how to deal with this, and will not
  work under these systems; just making it set-group-id will open a
  security hole (since it doesn't know when to drop the set-gid
  privileges). If you're using "mailgroup", you should remove slocal
  (and its man page) from your system.

  Alternatives to slocal include deliver, procmail, and mailagent.
  (See "What mail filters are available?")

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