> - PMDF on  JHUVMS realizes that  it cannot deliver  mail to user  Y and
>   attempts to return the mail. It picks up the address in the "Sender:"
>   field and voila, Listserv@JHUVM ends up with the mail.
 
Who said  the "Sender:" field points  to LISTSERV? It normally  points to
the user who submitted  the job (or rather, the user  sets it to whatever
he wants  and if  it doesn't match  his address, the  job is  returned to
him). Could you send me an example of these delivery notices?
 
  Eric