1.1.  Internet Mailing Lists

   The Internet community distributes news by the use of mailing lists.
   These are lists of subscriber's mailbox addresses and remailing
   sublists of all intended recipients.  These mailing lists operate by
   remailing a copy of the information to be distributed to each
   subscriber on the mailing list.  Such remailing is inefficient when a
   mailing list grows beyond a dozen or so people, since sending a
   separate copy to each of the subscribers occupies large quantities of
   network bandwidth, CPU resources, and significant amounts of disk
   storage at the destination host.  There is also a significant problem
   in maintenance of the list itself: as subscribers move from one job
   to another; as new subscribers join and old ones leave; and as hosts
   come in and out of service.