[Dovecot] Dovecot Listescape plugin problem

[vupibi]

Dovecot Version: 2.0.19

I'm on Ubuntu 12.04.3 using Zentyal with Dovecot for a mail Server. What I
try to setup is the possibility to use slashes ("/") in folder names inside
the IMAP account. Regularly if I name a folder "foo/bar", the system creates
me a folder named "bar" inside a folder named "foo". Listescape should give
me the possibility but it does not work. 
It's not possible for me to write inside the "/etc/dovecot/dovecot.conf"
because Zentyal will overwrite all changes when restarting the server. So my
Configs are in "/etc/dovecot/extra.conf" and look like this:

mail_plugins = listescape
(i tried "mail_plugins = $mail_plugins listescape" as well, no success)

namespace inbox {
  separator = "\\"
  prefix =
  inbox = yes
  hidden = no
  list = yes
  location = maildir:/var/vmail/%d/%n:LAYOUT=fs
}

My dovecot -n output

# 2.0.19: /etc/dovecot/dovecot.conf
# OS: Linux 3.2.0-55-generic x86_64 Ubuntu 12.04.3 LTS ext4
auth_gssapi_hostname = mailand.sxps.local
auth_krb5_keytab = /etc/dovecot/dovecot.keytab
auth_mechanisms = gssapi plain
first_valid_gid = 116
first_valid_uid = 108
log_timestamp = "%Y-%m-%d %H:%M:%S "
mail_gid = 116
mail_home = /var/vmail/sieve/%d/%u
mail_location = maildir:/var/vmail/%$
mail_plugins = listescape
mail_uid = 108
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope encoded-character
vacation subaddress comparator-i;ascii-numeric relational regex imap4flags
copy include variables body enotify environment mailbox date ihave
namespace inbox {
  hidden = no
  inbox = yes
  list = yes
  location = maildir:/var/vmail/%d/%n:LAYOUT=fs
  prefix = 
  separator = \
}
passdb {
  args = /etc/dovecot/dovecot-ldap.conf
  driver = ldap
}
plugin {
  autocreate = Trash
  autocreate2 = Spam
  autocreate3 = Sent
  autocreate4 = Drafts
  autosubscribe = Trash
  autosubscribe2 = Spam
  autosubscribe3 = Sent
  autosubscribe4 = Drafts
  quota = maildir:User quota
  quota_rule = *:storage=0
  sieve = /var/vmail/sieve/%d/%u/sieve-script
  sieve_global_path = /var/vmail/sieve/default.sieve
  sieve_storage = /var/vmail/sieve/%d/%u
}
protocols = pop3 imap sieve
service auth {
  executable = /usr/lib/dovecot/auth
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0660
    user = postfix
  }
  unix_listener auth-master {
    group = ebox
    mode = 0600
    user = ebox
  }
  user = dovecot
}
service imap-login {
  inet_listener imap {
    port = 143
  }
  inet_listener imaps {
    port = 993
  }
}
service managesieve-login {
  inet_listener sieve {
    port = 4190
  }
}
service pop3-login {
  inet_listener pop3 {
    port = 110
  }
  inet_listener pop3s {
    port = 995
  }
}
ssl_cert = </etc/dovecot/ssl/dovecot.pem
ssl_key = </etc/dovecot/ssl/dovecot.pem
userdb {
  args = /etc/dovecot/dovecot-ldap.conf
  driver = ldap
}
protocol imap {
  mail_plugins = quota imap_quota autocreate
}
protocol pop3 {
  mail_plugins = quota
}
protocol lda {
  auth_socket_path = /var/run/dovecot/auth-master
  mail_plugins = sieve quota
  postmaster_address = admin at sxps.eu
}


Any Ideas?



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