[exim] 4xx for mail-abuse.org rbl

i am trying to do something like

  # Reject messages from senders listed in these DNSBLs
  deny    message       = reject mail from dialup
          dnslists      = dialups.mail-abuse.org

  # Reject messages from senders listed in these DNSBLs
  deny    message       = reject mail from rbl blackholed sites
          dnslists      = blackholes.mail-abuse.org

  # Warn on messages from senders listed in these DNSBLs
  deny    message       = reject mail from qil spam sources
          dnslists      = qil.mail-abuse.org/warn

but

  o there is likely something simpler and more commonly done.  and
    i dislike being off the beaten track for no good reason.  so
    apply clue bat, please

  o in the last one, qil.mail-abuse.org, i want to generate a
    4xx, not a 5xx.  i suspect i am not accomplishing this with
    the /warn, but i could be incorrect.  hit me again, please.

oh, and why does google for 'exim mail-abuse' produce so paltry
a result?

randy