Dovecot Mailstore Server

doveconf -n
# 2.2.35 (b1cb664): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.4.22 (22940fb7)
# OS: Linux 3.10.0-862.el7.x86_64 x86_64 CentOS Linux release 7.5.1804 (Core)  nfs
# Hostname: imap4.rz.uni-duesseldorf.de
auth_cache_negative_ttl = 2 mins
auth_cache_size = 100 M
auth_cache_ttl = 2 mins
auth_default_realm = uni-duesseldorf.de
auth_master_user_separator = *
auth_mechanisms = plain login
default_vsz_limit = 1 G
disable_plaintext_auth = no
first_valid_uid = 2
mail_fsync = always
mail_home = /var/spool/mail/%d/%1n/%n
mail_location = mdbox:/var/spool/mail/%d/%1n/%n
mail_plugins = quota
mail_privileged_group = mail
mailbox_list_index = yes
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 index ihave duplicate mime $
oreverypart extracttext editheader imapflags notify imapsieve vnd.dovecot.imapsieve
mbox_write_locks = fcntl
mmap_disable = yes
namespace {
  list = children
  location = mdbox:/var/spool/mail/%%d/%%1n/%%n
  prefix = shared/%%u/
  separator = /
  subscriptions = no
  type = shared
}
namespace inbox {
  inbox = yes
  location =
  mailbox Drafts {
    special_use = \Drafts
  }
  mailbox Junk {
    auto = subscribe
    autoexpunge = 4 weeks
    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 = /etc/dovecot/master-users
  driver = passwd-file
  master = yes
}
passdb {
  args = /etc/dovecot/dovecot-ldap.conf.ext
  driver = ldap
}
plugin {
  imapsieve_mailbox1_before = file:/etc/dovecot/sieve/report-spam.sieve
  imapsieve_mailbox1_causes = COPY
  imapsieve_mailbox1_name = Junk
  imapsieve_mailbox2_before = file:/etc/dovecot/sieve/report-ham.sieve
  imapsieve_mailbox2_causes = COPY
  imapsieve_mailbox2_from = Junk
  imapsieve_mailbox2_name = *
  quota = dict:User quota::file:/var/spool/mail/%d/%1n/%n/dovecot-quota
  quota_grace = 10%%
  quota_rule = *:storage=512M
  quota_warning = storage=95%% quota-warning 95 %u
  quota_warning2 = storage=80%% quota-warning 80 %u
  sieve = file:/var/spool/mail/%d/%1n/%n/sieve/scripts/;active=/var/spool/mail/%d/%1n/%n/sieve/active-script.sieve
  sieve_after = /etc/dovecot/sieve/99-sieve_after-spam.sieve
  sieve_before = /etc/dovecot/sieve/98-dedup.sieve
  sieve_extensions = +notify +imapflags +editheader
  sieve_global_extensions = +vnd.dovecot.pipe +vnd.dovecot.environment
  sieve_max_redirects = 25
  sieve_pipe_bin_dir = /usr/local/bin
  sieve_plugins = sieve_imapsieve sieve_extprograms
  sieve_redirect_envelope_from = orig_recipient
}
protocols = imap lmtp sieve
service anvil {
  client_limit = 12000
}
service auth {
  client_limit = 12000
  inet_listener {
    port = 12345
  }
}
service doveadm {
  inet_listener {
    port = 24245
  }
}
service imap-login {
  inet_listener imap {
    port = 143
  }
  process_limit = 4096
}
service imap {
  process_limit = 4096
}
service ipc {
  client_limit = 6000
}
service lmtp {
  inet_listener lmtp {
    address = 192.168.25.213
    port = 2525
  }
}
service managesieve-login {
  inet_listener sieve {
    port = 4190
  }
}
service quota-warning {
  executable = script /usr/local/bin/quota-warning.sh
  unix_listener quota-warning {
    mode = 0666
  }
}
ssl_cert = </etc/dovecot/cert/mail-cert.pem
ssl_key =  # hidden, use -P to show it
userdb {
  args = /etc/dovecot/dovecot-ldap-userdb.conf.ext
  driver = ldap
  override_fields = uid=dovecot gid=mail master_user=%u
}
protocol lmtp {
  mail_plugins = quota sieve
}
protocol imap {
  mail_max_userip_connections = 1000
  mail_plugins = quota imap_quota imap_sieve
}
local 192.168.25.0/24 {
  doveadm_password =  # hidden, use -P to show it
}