[Exim] no deliver to root

Hi!

I'm using exim together with the lastest cyrus-imapd. Mail is delivered by
the cyrus-deliver configured in the configure-file of exim. What I want now
is: local mails to "root" should not be delivered by cyrus(deliver) but in
the standard berkeley format in /var/spool/mail/root.

The transport-section for local delivery looks like

# local_delivery:
# driver = appendfile
# # file = /var/mail/$local_part
# file = /var/spool/mail/$local_part
# delivery_date_add
# envelope_to_add
# return_path_add
# # group = mail
# # mode = 0660

local_delivery:
driver = pipe
command = "/usr/cyrus/bin/deliver -m user.${local_part} ${local_part}"
return_output
return_path_add
prefix = ""
# user = cyrus
user = ${local_part}
group = users


What's to do therefore?

Thanks,

Gruss
Ch. Krempe
________________________________________________________________________

   Freie Universitaet Berlin     Christoph Krempe
    Universitaetsbibliothek
      - Rechenzentrum -          Systemverwaltung
   Garystrasse 39
   14195 Berlin
   Germany                       Tel: +0049/30/838 54583
                                 Fax: +0049/30/838 54582
                                 e-mail: ck@???
                                 URL:http://www.ub.fu-berlin.de/~ck
  ________________________________________________________________________