If I'm stupid give me one on the head but ...
JIM: the problem is  not that there is no Real Name  in the address but
that there is not ANY valid E-mail address to reply to. In your case it
would work  if I truncate POSTMASTER  to POSTMAST (if BITEARN  NODES is
correct ...) -  but if there is  no POSTMAST account at  your site ....
Christian