When a message is posted to a list which has one or more sub-lists (i.e.,
a super-list), LISTSERV combines the subscriber lists from the super-list
and all its sub-lists, eliminates duplicates, then sends the message to the
remaining addresses.

See http://www.lsoft.com/manuals/1.8d/owner/owner.html#2.13.11 and
http://www.lsoft.com/manuals/1.8d/owner/appendb.html#keySublists for
additional information.

On Wed, 31 Jul 2002, Pete Weiss <[log in to unmask]> wrote:

>Sort of: duplicate messages are sent to the same same subscriber on
>multiple lists when sent to multiple lists.  Dups are NOT sent when the
>same userid@host is part of multiple sub-lists (that's a particular
>LISTSERV construct defined withing the list headers and setable by the
>listserv-maintainer (not owner).

--
Paul Russell
Senior System Administrator
O&E Messaging Services Team
University of Notre Dame