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@mtomoaki_96kg(mtomoaki 96kg)

RockyLinux9.6 PostfixAdmin構築メモ（Dovecot設定）

1
Last updated at Posted at 2025-08-27

概要

Dovecotの設定(必要最低限)

環境

RockyLinux9.6（さくらのクラウド）
PostfixAdmin(3.3.15) - Sqlite

参考URL

https://www.gin-iro.work/mizuito/tec/centos/postfixadmin_postfix_dovecot_sqlite.htm
https://qiita.com/shadowhat/items/c194d2b6e589fc937106
https://www.rouge.gr.jp/~fuku/tips/postfixadmin/

事前作業

作業概要

サンプル設定　ここで使うドメイン一覧（仮）

URL or ホスト名
メールサーバのホスト名 admin.xxx.com
postfixadminの管理画面 https://admin.xxx.com/
postfixadminへ設定するドメイン① xxx.com
postfixadminへ設定するドメイン② app.xxx.com
postfixadminへ設定するドメイン③ blog.xxx.com
項目 内容
postfix 3.5.25
dovecot 2.3.16
uid vmail(989)
gid mail(12)
mail_location /var/vmail/(ドメイン名)/(ユーザ名)
  • POP3は無効化
  • IMAPSのみ（IMAPは無効）
  • TLS必須

Dovecot設定

Dovecotにて定義されている変数

%d domain
%u full username
%n user part (%u with no domain)

10-auth.conf

cp -p /etc/dovecot/conf.d/10-auth.conf /etc/dovecot/conf.d/10-auth.conf_org
vi /etc/dovecot/conf.d/10-auth.conf
以下を書き換え
---
#disable_plaintext_auth = yes
↓
disable_plaintext_auth = yes

!include auth-system.conf.ext
↓
#!include auth-system.conf.ext
（Dovecotのユーザは、すべてPostfixadminで管理するためコメントアウト。）

#!include auth-sql.conf.ext
↓
!include auth-sql.conf.ext
（SQLでユーザ認証をするようにする。）
---

10-mail.conf

cp -p /etc/dovecot/conf.d/10-mail.conf /etc/dovecot/conf.d/10-mail.conf_org
vi /etc/dovecot/conf.d/10-mail.conf
以下を書き換え
---
#mail_location = 
↓
mail_location = maildir:/var/vmail/%d/%n

first_valid_uid = 1000
#last_valid_uid = 0
↓
first_valid_uid = 989
last_valid_uid = 989
（vmailユーザのuidを指定）

#first_valid_gid = 1
#last_valid_gid = 0
↓
first_valid_gid = 12
last_valid_gid = 12
（vmailユーザのgidを指定）

---

10-master.conf

cp -p /etc/dovecot/conf.d/10-master.conf /etc/dovecot/conf.d/10-master.conf_org
vi /etc/dovecot/conf.d/10-master.conf
以下を書き換え
(port = 0に設定すると、無効化出来る。)
---
service imap-login {
  inet_listener imap {
    #port = 143
  }
  inet_listener imaps {
    #port = 993
    #ssl = yes
  }
↓
service imap-login {
  inet_listener imap {
    port = 0
  }
  inet_listener imaps {
    port = 993
    ssl = yes
  }
  
service pop3-login {
  inet_listener pop3 {
    #port = 110
  }
  inet_listener pop3s {
    #port = 995
    #ssl = yes
  }
}
↓
service pop3-login {
  inet_listener pop3 {
    port = 0
  }
  inet_listener pop3s {
    port = 0
    #ssl = yes
  }
}

  # Postfix smtp-auth
  #unix_listener /var/spool/postfix/private/auth {
  #  mode = 0666
  #}
↓
  # Postfix smtp-auth
  unix_listener /var/spool/postfix/private/auth {
    mode = 0666
    user = postfix
    group = postfix
  }
---

10-ssl.conf

cp -p /etc/dovecot/conf.d/10-ssl.conf /etc/dovecot/conf.d/10-ssl.conf_org
vi /etc/dovecot/conf.d/10-ssl.conf
以下を書き換え
("local_name (ドメイン名)"にて、ドメイン用のSSL証明書を定義する。)
---
ssl_cert = </etc/pki/dovecot/certs/dovecot.pem
ssl_key = </etc/pki/dovecot/private/dovecot.pem
↓
ssl_cert = </etc/pki/dovecot/certs/dovecot.pem
ssl_key = </etc/pki/dovecot/private/dovecot.pem
local_name xxx.com {
  ssl_cert = </etc/letsencrypt/live/xxx.com/fullchain.pem
  ssl_key = </etc/letsencrypt/live/xxx.com/privkey.pem
}
local_name app.xxx.com {
  ssl_cert = </etc/letsencrypt/live/app.xxx.com/fullchain.pem
  ssl_key = </etc/letsencrypt/live/app.xxx.com/privkey.pem
}
local_name blog.xxx.com {
  ssl_cert = </etc/letsencrypt/live/blog.xxx.com/fullchain.pem
  ssl_key = </etc/letsencrypt/live/blog.xxx.com/privkey.pem
}
---

15-lda.conf

(自動でメールディレクトリを作成する)

cp -p /etc/dovecot/conf.d/15-lda.conf /etc/dovecot/conf.d/15-lda.conf_org
vi /etc/dovecot/conf.d/15-lda.conf
以下を書き換え
---
#lda_mailbox_autocreate = no
↓
lda_mailbox_autocreate = yes
---

15-mailboxes.conf

IMAP メールボックスへ関連ディレクトリを自動作成＆自動購読する。
（この設定は無理に変更する必要ない。ここは私の好みです・・・）
以下参照
https://docs.redhat.com/ja/documentation/red_hat_enterprise_linux/9/html/deploying_mail_servers/automatically-subscribing-users-to-imap-mailboxesconfiguring-and-maintaining-a-dovecot-imap-and-pop3-server

cp -p /etc/dovecot/conf.d/15-mailboxes.conf /etc/dovecot/conf.d/15-mailboxes.conf_org
vi /etc/dovecot/conf.d/15-mailboxes.conf
以下を書き換え
---
# NOTE: Assumes "namespace inbox" has been defined in 10-mail.conf.
namespace inbox {
  # These mailboxes are widely used and could perhaps be created automatically:
  mailbox Drafts {
    special_use = \Drafts
  }
  mailbox Junk {
    special_use = \Junk
  }
  mailbox Trash {
    special_use = \Trash
  }

  # For \Sent mailboxes there are two widely used names. We'll mark both of
  # them as \Sent. User typically deletes one of them if duplicates are created.
  mailbox Sent {
    special_use = \Sent
  }
↓
# NOTE: Assumes "namespace inbox" has been defined in 10-mail.conf.
namespace inbox {
  # These mailboxes are widely used and could perhaps be created automatically:
  mailbox Drafts {
    special_use = \Drafts
    auto = subscribe
  }
  mailbox Junk {
    special_use = \Junk
    auto = subscribe
  }
  mailbox Trash {
    special_use = \Trash
    auto = subscribe
  }

  # For \Sent mailboxes there are two widely used names. We'll mark both of
  # them as \Sent. User typically deletes one of them if duplicates are created.
  mailbox Sent {
    special_use = \Sent
    auto = subscribe
  }
---

auth-sql.conf.ext

cp -p /etc/dovecot/conf.d/auth-sql.conf.ext /etc/dovecot/conf.d/auth-sql.conf.ext_org
vi /etc/dovecot/conf.d/auth-sql.conf.ext
以下を書き換え
---
passdb {
  driver = sql

  # Path for SQL configuration file, see example-config/dovecot-sql.conf.ext
  args = /etc/dovecot/dovecot-sql.conf.ext
}
↓
passdb {
  driver = sql

  # Path for SQL configuration file, see example-config/dovecot-sql.conf.ext
  args = /etc/dovecot/dovecot-sqlite.conf
}

userdb {
  driver = sql
  args = /etc/dovecot/dovecot-sql.conf.ext
}
↓
userdb {
  driver = sql
  args = /etc/dovecot/dovecot-sqlite.conf
}
---

SQL関連設定

https://github.com/postfixadmin/postfixadmin/blob/master/DOCUMENTS/DOVECOT.txt
を参考にしました。

vi /etc/dovecot/dovecot-sqlite.conf
---
driver = sqlite
connect = /srv/postfixadmin/database/postfixadmin.db
password_query = SELECT username AS user, password FROM mailbox WHERE username = '%n' AND active='1'
user_query = SELECT '/var/vmail/%d/%n' AS home, 989 AS uid, 12 AS gid, '*:bytes=' || quota AS quota_rule FROM mailbox WHERE username = '%n' AND active='1'
iterate_query = SELECT username as user FROM mailbox WHERE active = '1'
---

Dovecot設定反映

systemctl reload dovecot

次回は、バリュードメインの設定例

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