mail-hosting/etc/dovecot/dovecot.conf

#general settings
dovecot_config_version = 2.4.0
dovecot_storage_version = 2.4.0
listen = *, ::
login_greeting = Server ready.
mmap_disable = yes
mail_fsync = always
mail_nfs_index = yes
mail_nfs_storage = yes
auth_verbose = no
auth_verbose_passwords = no
auth_debug = no
auth_debug_passwords = no
mail_debug = no
mail_driver = maildir
mail_path = /var/mail/vmail/%{user | domain}/%{user | username}
mail_home = /var/mail/vmail/%{user | domain}/%{user | username}
mail_plugins {
  mail_compress = yes
  mail_crypt = yes
}
mailbox_list_index = yes
mail_always_cache_fields = date.save
imap_hibernate_timeout = 5s
mail_attribute {
  dict file {
    path = %{home}/dovecot-attributes
  }
}
crypt_global_private_key main {
  crypt_private_key_file = /etc/dovecot/ecprivkey.pem
}
crypt_global_public_key_file = /etc/dovecot/ecpubkey.pem
mail_compress_write_method = gz

#  sieve = file:~/sieve;active=~/.dovecot.sieve
sieve_script personal {
  driver = file
  path = ~/sieve
  active_path = ~/.dovecot.sieve
}
#  sieve_plugins = sieve_imapsieve
sieve_plugins {
  sieve_imapsieve = yes
}
  imapsieve_url = sieve://danwin1210.de
#}

#auth settings
auth_cache_size = 1M
auth_cache_ttl = 5mins
auth_cache_negative_ttl = 5mins
auth_default_domain = danwin1210.de
auth_username_chars = 
auth_mechanisms = plain login
auth_allow_weak_schemes = yes

#TLS parameters
ssl = required
ssl_server_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem
ssl_server_key_file = /etc/ssl/private/ssl-cert-snakeoil.key
ssl_client_ca_dir = /etc/ssl/certs
ssl_server_dh_file = /etc/dovecot/dh.pem
ssl_min_protocol = TLSv1.2
ssl_cipher_list = HIGH:!PSK:!aNULL:!MD5:!SHA:!CAMELLIA:!AES+SHA256:!AES+SHA384;
ssl_curve_list = X448:X25519:secp521r1:secp384r1
ssl_server_prefer_ciphers = server

#protocol setup
protocols = "imap pop3 lmtp sieve"
protocol imap {
  mail_plugins {
    imap_sieve = yes
    last_login = yes
  }
  imap_metadata = yes
}
protocol pop3 {
  mail_plugins {
    last_login = yes
  }
  imap_metadata = yes
}
protocol lmtp {
  mail_plugins {
    sieve = yes
  }
}
protocol sieve {
  mail_plugins {
    last_login = yes
  }
}
#service setup
service anvil {
  unix_listener anvil {
    mode = 0666
  }
}
service auth {
  unix_listener auth-userdb {
    mode = 0666
    user = postfix
    group = postfix
  }
  unix_listener /var/spool/postfix/private/auth {
    mode = 0666
    user = postfix
    group = postfix
  }

  inet_listener auth-port {
    port = 12345
  }

  user = dovecot
  group = dovecot
  client_limit=2448
}
service auth-worker {
  unix_listener auth-worker {
    mode = 0666
    user = dovecot
    group = dovecot
  }
}
service imap {
  service_restart_request_count = 1000
  client_limit = 1
  unix_listener imap-master {
    user = dovecot
  }
}
service imap-login {
  inet_listener imap {
    port = 143
  }
  service_restart_request_count = 1000
  vsz_limit = 1G
  process_min_avail = 1
}
service lmtp {
  unix_listener /var/spool/postfix/private/dovecot-lmtp {
    mode = 0660
    user = postfix
    group = postfix
  }
  user = vmail
  group = vmail
}
service pop3 {
  service_restart_request_count = 1000
  client_limit = 1
}
service pop3-login {
  inet_listener pop3 {
    port = 110
  }
  service_restart_request_count = 1000
  vsz_limit = 1G
}

passdb sql {
  driver = sql
  query = SELECT username AS user, CONCAT(password_hash_type, password) AS password, 5000 AS userdb_uid, 5000 AS userdb_gid, CONCAT('*:bytes=', quota) AS userdb_quota_rule FROM mailbox WHERE username = CONCAT('%{user | username}', '@', COALESCE((SELECT target_domain FROM alias_domain WHERE alias_domain = '%{user | domain}' AND active='1'), '%{user | domain}')) AND active='1'
}
userdb sql {
  driver = sql
  query = SELECT 5000 AS uid, 5000 AS gid, CONCAT('*:bytes=', quota) AS quota_rule FROM mailbox WHERE username = CONCAT('%{user | username}', '@', COALESCE((SELECT target_domain FROM alias_domain WHERE alias_domain = '%{user | domain}' AND active='1'), '%{user | domain}')) AND active='1'
  iterate_query = SELECT username AS user FROM mailbox
}

#namespace configuration
namespace inbox {
  inbox = yes
  mailbox Drafts {
    auto = subscribe
    special_use = \Drafts
  }
  mailbox Junk {
    special_use = \Junk
  }
  mailbox Trash {
    auto = subscribe
    special_use = \Trash
    autoexpunge = 30d
  }

  mailbox Sent {
    auto = subscribe
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    special_use = \Sent
  }
}
mysql localhost {
  dbname=postfix
  user=postfix
  password=YOUR_PASSWORD
}
sql_driver = mysql

last_login {
  dict proxy {
    name = sql
  }
  key = last-login/%{user}
  precision = s
}

dict_server {
  dict sql {
    dict_map shared/last-login/$user {
      sql_table = mailbox
      value_field last_login {
        type = uint
      }

      key_field username {
        value = $user
      }
    }
  }
}