[exim] cannot find router driver "appendfile"

Hi list

I am at a loss. This is probably a basic error on my part. I hope
someone can advice. :-)

My error from running invoke-rc.d exim4 restart

Exim configuration error.
router dovecot_transport: cannot find router driver "appendfile"


My setup on Debian Lenny:

# /etc/exim4/conf.d/router/881_local-dovecot_mailbox_bind
dovecot_router:
driver = accept
local_part_suffix = +*
local_part_suffix_optional
require_files = +/home/postmaster/mailboxes/${local_part}/
transport = dovecot_transport

# /etc/exim4/conf.d/router/881_local-dovecot_mailbox_store
dovecot_transport:
driver = appendfile
user = dovecot
group = dovecot
mode = 0600
directory=/home/postmaster/mailboxes/${lc:$local_part}/
maildir_format = true
mode_fail_narrower = false
envelope_to_add = true
return_path_add = true

Based on http://wiki.dovecot.org/HowTo/VirtualhostingWithExim
--
Daniel