[exim] Exim 4.62 and Cyrus IMAP shared subfolders

Hi All,

Has anybody have a sample transport for delivering mail to subfolders
using cyrus's lmtp or a pipe?
This is how our config looks like:

local_delivery_cyrus:
  debug_print = "T: cyrus_shared_mail_boxes for $local_part@$domain"
  driver = pipe
  #socket = /var/lib/imap/socket/lmtp
  command = /usr/lib/cyrus-imapd/deliver \
         #-m ${substr_1:${local_part_suffix}} -- $local_part_prefix
         $local_part
  user = cyrus
  group = mail

Thanks for your help.

Rudolf