Dovecot does not serve mail from folders to the client. What could be the problem?

Question

Email

There is a mail server on iredmail 0.9.0. Respectively dovecot 2.2.9. Letters arrive in the inbox directory of users and are immediately displayed in the client (outlook, thunderbird). But if the user has other directories, to which the incoming messages get through the sieve or outlook filter, then such letters are not visible on the client until the user enters the directory. What could be the problem?
dovecot config:

# 2.2.9: /etc/dovecot/dovecot.conf
# OS: Linux 3.13.0-68-generic x86_64 Ubuntu 14.04.2 LTS
auth_debug = yes
auth_debug_passwords = yes
auth_master_user_separator = *
auth_mechanisms = PLAIN LOGIN
auth_verbose = yes
dict {
  acl = mysql:/etc/dovecot/dovecot-share-folder.conf
  quotadict = mysql:/etc/dovecot/dovecot-used-quota.conf
}
disable_plaintext_auth = no
first_valid_uid = 2000
last_valid_uid = 2000
listen = * [::]
log_path = /var/log/dovecot.log
mail_debug = yes
mail_gid = 2000
mail_location = maildir:/%Lh/Maildir/:INDEX=/%Lh/Maildir/
mail_plugins = quota mailbox_alias acl
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 =
  mailbox Drafts {
    auto = subscribe
    special_use = \Drafts
  }
  mailbox Junk {
    auto = subscribe
    special_use = \Junk
  }
  mailbox Sent {
    auto = subscribe
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    auto = no
    special_use = \Sent
  }
  mailbox Spam {
    auto = no
    special_use = \Junk
  }
  mailbox Trash {
    auto = subscribe
    special_use = \Trash
  }
  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-ldap.conf
  driver = ldap
}
passdb {
  args = /etc/dovecot/dovecot-master-users
  driver = passwd-file
  master = yes
}
plugin {
  acl = vfile
  acl_shared_dict = proxy::acl
  auth_socket_path = /var/run/dovecot/auth-master
  mailbox_alias_new = Sent Messages
  mailbox_alias_new2 = Sent Items
  mailbox_alias_old = Sent
  mailbox_alias_old2 = Sent
  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_before = /var/vmail/sieve/dovecot.sieve
  sieve_dir = /%Lh/sieve
  sieve_global_dir = /var/vmail/sieve
  sieve_max_redirects = 40
}
protocols = pop3 imap sieve lmtp
service auth {
  unix_listener /var/spool/postfix/private/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 = 400
  process_min_avail = 50
  service_count = 0
  vsz_limit = 256 M
}
service lmtp {
  executable = lmtp -L
  inet_listener lmtp {
    port = 24
  }
  process_min_avail = 10
  unix_listener /var/spool/postfix/private/dovecot-lmtp {
    group = postfix
    mode = 0600
    user = postfix
  }
  user = vmail
}
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_cert = </etc/ssl/old/iRedMail.crt
ssl_key = </etc/ssl/old/iRedMail.key
ssl_protocols = !SSLv2 !SSLv3
userdb {
  args = /etc/dovecot/dovecot-ldap.conf
  driver = ldap
}
protocol lda {
  auth_socket_path = /var/run/dovecot/auth-master
  lda_mailbox_autocreate = yes
  log_path = /var/log/dovecot-sieve.log
  mail_plugins = quota mailbox_alias acl sieve
  postmaster_address = root
}
protocol lmtp {
  info_log_path = /var/log/dovecot-lmtp.log
  lmtp_save_to_detail_mailbox = yes
  mail_plugins = quota sieve
  postmaster_address = postmaster
  recipient_delimiter = +
}
protocol imap {
  imap_client_workarounds = tb-extra-mailbox-sep
  mail_max_userip_connections = 250
  mail_plugins = quota mailbox_alias acl imap_quota imap_acl
}
protocol pop3 {
  mail_max_userip_connections = 20
  mail_plugins = quota mailbox_alias acl
  pop3_client_workarounds = outlook-no-nuls oe-ns-eoh
  pop3_uidl_format = %08Xu%08Xv
}

Answer 1

The client checks only the mail in the inbox. The sieve filter puts mail bypassing the inbox so the client doesn't see it. In TB, this is solved by setting mail.server.default.check_all_folders_for_new - in this case, TB will check mail in all folders - well, or right-click on the folder and enable the item "When new messages are received, check this folder". And the fact that letters are shown when you enter the directory is understandable - you went in and the directory was reindexed.