[Dovecot] quota is not ignoring trash

[JC]

I have debian lenny configured with postfix 2.5.5 and dovecot 1.0.15 with mysql,
every user has a different quota. The problem is that the quota is not ignoring
trash folder, how can I solve this problem? And another question, is there a
possibility to ignore sent folder?.

this is my dovecot.conf

smtp:# dovecot -n
# 1.0.15: /etc/dovecot/dovecot.conf
base_dir: /var/run/dovecot/
log_path: /var/log/mail.log
log_timestamp: %Y-%m-%d %H:%M:%S
protocols: pop3 imap
disable_plaintext_auth: no
login_dir: /var/run/dovecot/login
login_executable(default): /usr/lib/dovecot/imap-login
login_executable(imap): /usr/lib/dovecot/imap-login
login_executable(pop3): /usr/lib/dovecot/pop3-login
login_processes_count: 5
login_max_processes_count: 256
login_max_connections: 512
max_mail_processes: 512
first_valid_uid: 5000
last_valid_uid: 5000
first_valid_gid: 5000
mail_access_groups: vmail
mail_privileged_group: vmail
mail_location: maildir:/home/vmail/%d/%n
maildir_copy_with_hardlinks: yes
maildir_copy_preserve_filename: yes
mail_executable(default): /usr/lib/dovecot/imap
mail_executable(imap): /usr/lib/dovecot/imap
mail_executable(pop3): /usr/lib/dovecot/pop3
mail_plugins(default): quota imap_quota trash
mail_plugins(imap): quota imap_quota trash
mail_plugins(pop3): quota
mail_plugin_dir(default): /usr/lib/dovecot/modules/imap
mail_plugin_dir(imap): /usr/lib/dovecot/modules/imap
mail_plugin_dir(pop3): /usr/lib/dovecot/modules/pop3
imap_client_workarounds(default): outlook-idle delay-newmail
imap_client_workarounds(imap): outlook-idle delay-newmail
imap_client_workarounds(pop3): outlook-idle
pop3_uidl_format(default):
pop3_uidl_format(imap):
pop3_uidl_format(pop3): %08Xu%08Xv
pop3_client_workarounds(default):
pop3_client_workarounds(imap):
pop3_client_workarounds(pop3): outlook-no-nuls oe-ns-eoh
namespace:
  type: private
  separator: .
  prefix: INBOX.
  inbox: yes
auth default:
  mechanisms: plain login
  user: vmail
  passdb:
    driver: sql
    args: /etc/dovecot/dovecot-sql.conf
  userdb:
    driver: prefetch
  userdb:
    driver: sql
    args: /etc/dovecot/dovecot-sql.conf
  socket:
    type: listen
    client:
      path: /var/spool/postfix/private/auth
      mode: 432
      user: postfix
      group: vmail
    master:
      path: /var/run/dovecot/auth-master
      mode: 432
      user: vmail
      group: vmail
plugin:
  quota: maildir:storage=51200:ignore=Trash
  trash: /etc/dovecot/dovecot-trash.conf


this is my dovecot-sql.conf

driver = mysql
connect = host=127.0.0.1 dbname=maildb user=xxx password=yyy
default_pass_scheme = CRYPT
password_query = SELECT email AS user, password FROM users WHERE email = '%u'
user_query = SELECT 'maildir:/home/vmail/%d/%n' AS home, 5000 AS uid, 5000 AS
gid, CONCAT('maildir:storage=', ROUND( quota / 1000 ) ) AS quota FROM users
WHERE email = '%u'