The  POSTMASTER business  means  that the  incoming  headers contained  a
RFC822    syntax   error.    In   such    cases   LISTSERV    substitutes
POSTMASTER@localnode for  the origin  and continues processing,  adding a
comment in  the header  about the  error. If the  list is  set up  as you
describe you do indeed get a copy of the message.
 
  Eric