==== Required information ====
- iRedMail version: latest
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): mysql
- Linux/BSD distribution name and version: centos 6.x
- Related log if you're reporting an issue: -
====

I use a default iredmail installation.
We want to use it for Imap/webmail service only with serveral client devices, and so the problem starts...

For example:
- a iphone imap client use/create the directory's : inbox, spam, trash, drafts
- a outlook 2013 client use/create : inbox, junk, deleted, drafts
- a outlook 2010 client use/create : inbox, junk mail, deleted items, drafts
- a android device use/create: inbox, junk, deleted, spam, bla

if the language is other then english you get this (netherlands)
- a iphone imap client use/create the directory's : inbox, ongewenst, prullenbak, iets
- a outlook 2013 client use/create : inbox, junk, verwijderd, bla

When a user use outlook and iphone and maybe webmail then you get multiple directory's with the same goal.
spam, junk, junk mail are the same
trash,deleted, deleted items, verwijderd are the same

How can we fix this ?

I assume its dovecot to handle this ?

doveconf -n
# 2.0.21: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.32-358.23.2.el6.x86_64 x86_64 CentOS release 6.4 (Final)
auth_master_user_separator = *
auth_mechanisms = PLAIN LOGIN
dict {
  acl = mysql:/etc/dovecot/dovecot-share-folder.conf
  quotadict = mysql:/etc/dovecot/dovecot-used-quota.conf
}
first_valid_uid = 2000
last_valid_uid = 2000
listen = *
log_path = /var/log/dovecot.log
mail_gid = 2000
mail_location = maildir:/%Lh/Maildir/:INDEX=/%Lh/Maildir/
mail_plugins = quota
mail_uid = 2000
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 = yes
  location =
  prefix =
  separator = /
  type = private
}
namespace {
  list = children
  location = maildir:/%%Lh/Maildir/:INDEX=/%%Lh/Maildir/Shared/%%u
  prefix = Shared/%%u/
  separator = /
  subscriptions = yes
  type = shared
}
passdb {
  args = /etc/dovecot/dovecot-mysql.conf
  driver = sql
}
passdb {
  args = /etc/dovecot/dovecot-master-users-password
  driver = passwd-file
  master = yes
}
plugin {
  acl = vfile
  acl_shared_dict = proxy::acl
  auth_socket_path = /var/run/dovecot/auth-master
  autocreate = INBOX
  autocreate2 = Sent
  autocreate3 = Trash
  autocreate4 = Drafts
  autocreate5 = Junk
  autosubscribe = INBOX
  autosubscribe2 = Sent
  autosubscribe3 = Trash
  autosubscribe4 = Drafts
  autosubscribe5 = Junk
  quota = dict:user::proxy::quotadict
  quota_rule = *:storage=1G
  quota_warning = storage=85%% quota-warning 85 %u
  quota_warning2 = storage=90%% quota-warning 90 %u
  quota_warning3 = storage=95%% quota-warning 95 %u
  sieve = /%Lh/sieve/dovecot.sieve
  sieve_dir = /%Lh/sieve
  sieve_global_dir = /var/vmail/sieve
  sieve_global_path = /var/vmail/sieve/dovecot.sieve
}
protocols = pop3 imap sieve
service auth {
  unix_listener /var/spool/postfix/dovecot-auth {
    group = postfix
    mode = 0666
    user = postfix
  }
  unix_listener auth-master {
    group = vmail
    mode = 0666
    user = vmail
  }
  unix_listener auth-userdb {
    group = vmail
    mode = 0660
    user = vmail
  }
}
service dict {
  unix_listener dict {
    group = vmail
    mode = 0660
    user = vmail
  }
}
service imap-login {
  process_limit = 500
  service_count = 1
}
service pop3-login {
  service_count = 1
}
service quota-warning {
  executable = script /usr/local/bin/dovecot-quota-warning.sh
  unix_listener quota-warning {
    group = vmail
    mode = 0660
    user = vmail
  }
}
ssl = required
ssl_ca = </etc/pki/tls/certs/STAR_rexxxxxx.ca-bundle
ssl_cert = </etc/pki/tls/certs/iRedMail_CA.pem
ssl_key = </etc/pki/tls/private/iRedMail.key
userdb {
  args = /etc/dovecot/dovecot-mysql.conf
  driver = sql
}
protocol lda {
  auth_socket_path = /var/run/dovecot/auth-master
  lda_mailbox_autocreate = yes
  log_path = /var/log/sieve.log
  mail_plugins = quota sieve autocreate
  postmaster_address = root
}
protocol imap {
  imap_client_workarounds = tb-extra-mailbox-sep
  mail_plugins = quota imap_quota autocreate
}
protocol pop3 {
  mail_plugins = quota
  pop3_client_workarounds = outlook-no-nuls oe-ns-eoh
  pop3_uidl_format = %08Xu%08Xv
}