While it won't solve the problem, setting your SMTP to NOMAIL is always a
good thing to do.  There is no reason to let your  mailer deliver mail to
SMTP when all SMTP will do is reply with that kind of error message.
 
The  problem  is  that  your  SMTP   somehow  decided  to  send  mail  to
[log in to unmask]  SMTP shouldn't  send  mail  to anyone  unless  it is  a
delivery error,  and LISTSERV definitely  knows how to trap  FAL delivery
errors.  Besides,  delivery  errors   wouldn't  start  with  "LISTSERV*".
Something else must  be wrong - maybe SMTP isn't  configured to always go
through its mailer for RSCS addresses.
 
  Eric