Point the sender  to LISTSERV, and mail errors are  going to be processed
by LISTSERV as commands, with the result that the original delivery error
is lost, and that  you start a "mailing war" with  the mailer in question
(probably a  gateway) until it gets  served off, after 10  attempts. Then
you'll  be very  happy  because  any mail  coming  from  this gateway  is
discarded unread.
 
Point the  sender to "listname-ERRORS@nodeid",  and you'll have a  lot of
fun if the list  name is 8 characters; otherwise you'll  need to create a
VM account  by the name of  the first 8 characters  of "listname-ERRORS",
courtesy of the  countless mailers which send mail directly,  via NJE, to
the destination. Neither solution  is satisfactory, personally I'd rather
opt for the contents of the "Sender=" keyword (if present), or the userid
of  the main  list owner  if  there's no  "Sender="; that  makes sure  he
*does* take care to define a "Sender=" :-)
 
  Eric