[Dovecot] dovecot-1.1 not using sieve

[Thomas Carstensen]

hi,

im using the atrpm packages dovecot-1.1.11-0_90.el5 and
dovecot-sieve-1.1.6-9.el5 on a centos5.2 in combination with exim/vexim,
mysql and virtual users.

everything (delivery /sending) seems to work out fine, but i can't use
sieve filters, unfortunately when doing a dovecot -n sieve doesn't show
up anywhere:

# 1.1.11: /etc/dovecot.conf
# OS: Linux 2.6.18-92.1.22.el5 x86_64 CentOS release 5.2 (Final) ext3
listen: *
login_dir: /var/run/dovecot/login
login_executable(default): /usr/libexec/dovecot/imap-login
login_executable(imap): /usr/libexec/dovecot/imap-login
login_executable(pop3): /usr/libexec/dovecot/pop3-login
first_valid_uid: 90
mail_location: /usr/local/mail/%d/%u
mail_executable(default): /usr/libexec/dovecot/imap
mail_executable(imap): /usr/libexec/dovecot/imap
mail_executable(pop3): /usr/libexec/dovecot/pop3
mail_plugin_dir(default): /usr/lib64/dovecot/imap
mail_plugin_dir(imap): /usr/lib64/dovecot/imap
mail_plugin_dir(pop3): /usr/lib64/dovecot/pop3
auth default:
  mechanisms: plain digest-md5 cram-md5 ntlm rpa
  passdb:
    driver: sql
    args: /etc/dovecot-sql.conf
  userdb:
    driver: sql
    args: /etc/dovecot-sql.conf

in dovecot.conf i added following:

protocol lda {
  # Address to use when sending rejection mails.
  postmaster_address = postmaster at mail.xxxxxxxx.com

  # Hostname to use in various parts of sent mails, eg. in Message-Id.
  # Default is the system's real hostname.
  #hostname =

  # Support for dynamically loadable plugins. mail_plugins is a space
separated
  # list of plugins to load.
#  mail_plugins = cmusieve
  mail_plugin_dir = /usr/lib64/dovecot/lda
  mail_plugins = cmusieve
  # Binary to use for sending mails.
  sendmail_path = /usr/lib/sendmail

 any hints?

regards,
thomas