quota warning configuration problem

[Przemysław Orzechowski]

Hi

Im trying to setup automatic quota warning in dovecot but somehow cant 
get it to work
Quota usage is displayed properly in roundcube so quota plugin is working.
But somehow i cant get quota warning to work
my dovecot is 2.2.9 (stock version in ubuntu)
doveconf -n output in attached file
dovecot-quota-warning-sh is as found in wiki

Best regards
Przemysław Orzechowski
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# 2.2.9: /etc/dovecot/dovecot.conf
# OS: Linux 3.13.0-29-generic x86_64 Ubuntu 14.04 LTS 
auth_mechanisms = plain login
imap_client_workarounds = delay-newmail
mail_location = maildir:~/Maildir:INDEX=/var/lib/dovecot-virtualmin/index/%u:CONTROL=/var/lib/dovecot-virtualmin/control/%u
mail_plugins = quota
namespace inbox {
  inbox = yes
  location = 
  mailbox Drafts {
    special_use = \Drafts
  }
  mailbox Junk {
    special_use = \Junk
  }
  mailbox Sent {
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    special_use = \Sent
  }
  mailbox Trash {
    special_use = \Trash
  }
  prefix = 
}
passdb {
  driver = pam
}
plugin {
  quota = fs:Limit_uzytkownika:user
  quota2 = fs:Limit_domeny:group
  quota_warning = storage=95%% quota-warning 95 %u
  quota_warning01 = Limit_uzytkownika=95%% quota-warning 95 %u
  quota_warning02 = Limit_uzytkownika=80%% quota-warning 80 %u
  quota_warning2 = storage=90%% quota-warning 80 %u
}
postmaster_address = postmaster@
protocols = imap pop3 pop3
service imap-login {
  inet_listener imap {
    port = 0
  }
  inet_listener imaps {
    address = *
    port = 993
    ssl = yes
  }
}
service pop3-login {
  inet_listener pop3 {
    port = 0
  }
  inet_listener pop3s {
    address = *
    port = 995
    ssl = yes
  }
}
service quota-warning {
  executable = script /usr/local/bin/quota-warning.sh
  unix_listener quota-warning {
    user = vmail
  }
  user = dovecot
}
ssl_ca = </etc/ssl/ca-bundle.crt
ssl_cert = </etc/ssl/ssl.crt
ssl_key = </etc/ssl/ssl.key
userdb {
  driver = passwd
}
protocol lda {
  mail_plugins = quota
}
protocol imap {
  mail_plugins = quota imap_quota
  service imap-login {
    inet_listener imaps {
      address = *
      port = 993
    }
  }
}