Title: CodingBunny Mail SMTP
Author: CodingBunny
Published: <strong>2026年1月28日</strong>
Last modified: 2026年9月29日

---

プラグインを検索

![](https://ps.w.org/coding-bunny-mail-smtp/assets/banner-772x250.png?rev=3723046)

![](https://ps.w.org/coding-bunny-mail-smtp/assets/icon-256x256.png?rev=3448496)

# CodingBunny Mail SMTP

 作者: [CodingBunny](https://profiles.wordpress.org/codingbunny/)

[ダウンロード](https://downloads.wordpress.org/plugin/coding-bunny-mail-smtp.1.0.6.zip)

 * [詳細](https://ja.wordpress.org/plugins/coding-bunny-mail-smtp/#description)
 * [レビュー](https://ja.wordpress.org/plugins/coding-bunny-mail-smtp/#reviews)
 *  [インストール](https://ja.wordpress.org/plugins/coding-bunny-mail-smtp/#installation)
 * [開発](https://ja.wordpress.org/plugins/coding-bunny-mail-smtp/#developers)

 [サポート](https://wordpress.org/support/plugin/coding-bunny-mail-smtp/)

## 説明

CodingBunny Mail SMTP allows you to easily configure an SMTP server to send all 
outgoing emails from your WordPress website.

By default, WordPress uses the `wp_mail()` function which relies on the server’s
PHP mail configuration. This often leads to delivery issues or emails ending up 
in spam. This plugin solves that problem by routing emails through a reliable SMTP
server.

### Key Features

 * Enable or disable SMTP with a single toggle
 * Supports SSL, TLS, or no encryption
 * SMTP port suggested automatically based on the encryption type
 * Optional SMTP authentication (username & password)
 * Secure password storage using encryption
 * Settings can be defined as constants in wp-config.php
 * Custom “From Email” and “From Name”
 * Built-in test email tool
 * Failed emails log with configurable retention
 * Lightweight, no third-party dependencies
 * Fully compatible with WordPress PHPMailer
 * Clean and accessible admin interface

### Security

The SMTP password is encrypted before being stored in the database and is never 
displayed in plain text in the WordPress admin area. For maximum security, you can
define it as a constant in wp-config.php so that it is never stored in the database
at all.

### Configuration

You can configure the following options:

 * SMTP Host (e.g. `smtp.example.com`)
 * SMTP Port (e.g. `587`)
 * Encryption: None, TLS, or SSL
 * Enable/Disable SMTP authentication
 * SMTP Username & Password
 * Sender Email Address
 * Sender Name

After saving, use the Test Email section to verify your configuration.

### Configuration via wp-config.php

Every setting can also be defined as a constant in `wp-config.php`. Constants take
priority over the values saved in the admin area, and the related fields are shown
as read-only.

 * `define( 'CODINGBUNNY_MAIL_SMTP_ENABLED', true );`
 * `define( 'CODINGBUNNY_MAIL_SMTP_HOST', 'smtp.example.com' );`
 * `define( 'CODINGBUNNY_MAIL_SMTP_PORT', 587 );`
 * `define( 'CODINGBUNNY_MAIL_SMTP_ENCRYPTION', 'tls' );` (`none`, `tls` or `ssl`)
 * `define( 'CODINGBUNNY_MAIL_SMTP_AUTH', true );`
 * `define( 'CODINGBUNNY_MAIL_SMTP_USERNAME', 'user@example.com' );`
 * `define( 'CODINGBUNNY_MAIL_SMTP_PASSWORD', 'your-password' );`
 * `define( 'CODINGBUNNY_MAIL_SMTP_FROM_EMAIL', 'noreply@example.com' );`
 * `define( 'CODINGBUNNY_MAIL_SMTP_FROM_NAME', 'My Website' );`

You can define only the constants you need: the remaining settings are read from
the admin area.

### Uninstall

When the plugin is uninstalled, all plugin options (including encrypted credentials
and the failed emails log) are removed from the database.

## スクリーンショット

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## インストール

 1. Upload the `codingbunny-mail-smtp` folder to the `/wp-content/plugins/` directory
    
    or
 2. Install the plugin via the WordPress Plugins screen
 3. Activate the plugin through the **Plugins** menu in WordPress
 4. Go to **Settings  CodingBunny Mail SMTP**
 5. Configure your SMTP details and save

## FAQ

### Does this plugin replace wp_mail()?

Yes. The plugin hooks into WordPress PHPMailer and sends all emails via SMTP when
enabled.

### Is the SMTP password secure?

Yes. The password is encrypted using WordPress salts and OpenSSL before being stored.
You can also define it in wp-config.php so that it is never stored in the database.

### What happens if I leave the password field empty?

The existing password will not be overwritten.

### Can I define the settings in wp-config.php?

Yes. See the “Configuration via wp-config.php” section for the full list of supported
constants.

### What does the failed emails log store?

Only the date, recipients, subject and error message of emails that WordPress failed
to send. The message content is never stored. Entries are deleted automatically 
after the retention period (30 days by default, maximum 100 entries), and you can
clear the log or disable it at any time.

### Can I disable SMTP temporarily?

Yes. Simply disable the “Enable SMTP” toggle.

### Does this plugin conflict with other mail plugins?

It is recommended to use only one SMTP/mail plugin at a time.

## 評価

このプラグインにはレビューがありません。

## 貢献者と開発者

CodingBunny Mail SMTP はオープンソースソフトウェアです。以下の人々がこのプラグイン
に貢献しています。

貢献者

 *   [ CodingBunny ](https://profiles.wordpress.org/codingbunny/)

[“CodingBunny Mail SMTP” をあなたの言語に翻訳しましょう。](https://translate.wordpress.org/projects/wp-plugins/coding-bunny-mail-smtp)

### 開発に興味がありますか ?

[コードを閲覧](https://plugins.trac.wordpress.org/browser/coding-bunny-mail-smtp/)
するか、[SVN リポジトリ](https://plugins.svn.wordpress.org/coding-bunny-mail-smtp/)
をチェックするか、[開発ログ](https://plugins.trac.wordpress.org/log/coding-bunny-mail-smtp/)
を [RSS](https://plugins.trac.wordpress.org/log/coding-bunny-mail-smtp/?limit=100&mode=stop_on_copy&format=rss)
で購読してみてください。

## 変更履歴

#### 1.0.6 – 09/29/2026

 * Improved: Redesigned admin interface, consistent with the other CodingBunny plugins
 * New: Sidebar navigation with separate sections for SMTP settings, test email 
   and failed emails log
 * New: Status panel showing whether SMTP is enabled, the server in use, the encryption
   and the sender address
 * New: The number of failed emails is shown next to the log section
 * Improved: After sending a test email or clearing the log you return to the same
   section

#### 1.0.5 – 09/27/2026

 * New: SMTP settings can be defined as constants in wp-config.php
 * New: The SMTP port is suggested automatically when the encryption type changes
 * New: Failed emails log with configurable retention and automatic daily cleanup
 * Fix: Saving the settings without re-entering the password no longer overwrites
   the stored SMTP password
 * Fix: Invalid border value in the admin button styles
 * Improved: SMTP port and encryption values are validated when saving
 * Improved: All admin buttons and toggles are keyboard-accessible

#### 1.0.4 – 08/28/2026

 * Updated: CodingBunny Mail SMTP is now tested up to WordPress 7.1

#### 1.0.3 – 03/06/2026

 * Updated: CodingBunny Mail SMTP is now tested up to WordPress 7
 * Improved: Added placeholder in the password field when it is set
 * Improved: Improved error handling
 * Improved: Optimized the sending of test emails
 * Improved: Improved compatibility with SMTP servers
 * Improved: Improved password security

#### 1.0.2 – 01/28/2026

 * Fix: Fixed a bug that deleted the test email when saving settings
 * Fix: Fixed a bug that prevented the Sender Name from working if the Sender Email
   was not set

#### 1.0.1 – 01/28/2026

 * Fix: Fixed test email saving error

#### 1.0.0 – 01/27/2026

 * New: Initial Release

## メタ

 *  バージョン **1.0.6**
 *  最終更新日 **1週間前**
 *  有効インストール数 **10+**
 *  WordPress バージョン ** 6.0またはそれ以降 **
 *  検証済み最新バージョン: **7.1.3**
 *  PHP バージョン ** 8.0またはそれ以降 **
 *  言語
 * [English (US)](https://wordpress.org/plugins/coding-bunny-mail-smtp/)
 * タグ
 * [email](https://ja.wordpress.org/plugins/tags/email/)[mail](https://ja.wordpress.org/plugins/tags/mail/)
   [phpmailer](https://ja.wordpress.org/plugins/tags/phpmailer/)[smtp](https://ja.wordpress.org/plugins/tags/smtp/)
   [wp_mail](https://ja.wordpress.org/plugins/tags/wp_mail/)
 *  [詳細を表示](https://ja.wordpress.org/plugins/coding-bunny-mail-smtp/advanced/)

## 評価

レビューはまだ送信されていません。

[Your review](https://wordpress.org/support/plugin/coding-bunny-mail-smtp/reviews/#new-post)

[すべてのレビューを見る](https://wordpress.org/support/plugin/coding-bunny-mail-smtp/reviews/)

## 貢献者

 *   [ CodingBunny ](https://profiles.wordpress.org/codingbunny/)

## サポート

意見や質問がありますか ?

 [サポートフォーラムを表示](https://wordpress.org/support/plugin/coding-bunny-mail-smtp/)