How about seting the Sender to this:
 
listname <LISTERR@node>
 
Have LISTERR try to figure out what list it came from.
 
  If it can then what happens next depends on the list.  Pick one:
    1) delete user from list if error notice
    2) forward mail to an address selected by the list owner
    3) ignore
  If the listname cannot be figured out and it looks like an
  error message then send it back to POSTMASTER@node as rejected
  mail and ask them to do something about there poor error messages.
  In the bounce back to POSTMASTER be sure to set the Sender and the
  From to something like LISTXXX@node and have all mail that comes to
  that address ignored.
 
Chad Adams <XCEA@ECNCDC>