Dovecot Director Server

doveconf -n
# 2.2.35 (b1cb664): /etc/dovecot/dovecot.conf
# OS: Linux 3.10.0-862.11.6.el7.x86_64 x86_64 Red Hat Enterprise Linux Server release 7.5 (Maipo) xfs
# Hostname: balder.rz.uni-duesseldorf.de
auth_default_realm = uni-duesseldorf.de
auth_master_user_separator = *
auth_mechanisms = plain login
director_mail_servers = 192.168.25.208 192.168.25.209 192.168.25.211 192.168.25.212 192.168.25.213
director_servers = 192.168.25.204 192.168.25.205 192.168.25.206 192.168.25.207 192.168.25.23
disable_plaintext_auth = no
doveadm_port = 24245
first_valid_uid = 2
lda_mailbox_autocreate = yes
lda_mailbox_autosubscribe = yes
lmtp_proxy = yes
mail_location = mdbox:/var/mail/%d/%1n/%n:INDEX=/var/indexes/%d/%1n/%n
mail_plugins = quota
mbox_write_locks = fcntl
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 =
  separator = /
  type = private
}
passdb {
  args = proxy=y nopassword=y
  driver = static
}
protocols = imap lmtp
service anvil {
  client_limit = 12000
}
service auth {
  client_limit = 8000
}
service director {
  fifo_listener login/proxy-notify {
    mode = 0666
  }
  inet_listener {
    port = 9090
  }
  unix_listener director-userdb {
    mode = 0600
  }
  unix_listener login/director {
    mode = 0666
  }
}
service doveadm {
  inet_listener {
    port = 24245
  }
}
service imap-login {
  executable = imap-login director
  process_limit = 2048
}
service imap {
  process_limit = 2048
}
service ipc {
  client_limit = 6000
}
service lmtp {
  inet_listener lmtp {
    address = 127.0.0.1
    port = 2525
  }
  process_limit = 2048
}
ssl = no
ssl_cert = </etc/pki/dovecot/certs/dovecot.pem
ssl_key =  # hidden, use -P to show it
syslog_facility = local0
protocol lmtp {
  auth_socket_path = director-userdb
}
protocol doveadm {
  auth_socket_path = director-userdb
}
local 192.168.25.0/24 {
  doveadm_password =  # hidden, use -P to show it
}