步骤如下：
- 通过 composer 获取代码库
- 获取 API Key 以及 domain
- 编写代码发送邮件
1. 首先通过 composer 获取依赖代码库，参考官网给的命令
https://documentation.mailgun.com/en/latest/libraries.html#php
composer require mailgun/mailgun-php php-http/guzzle6-adapter php-http/message
运行完成后在当前目录下生成 composer.json、composer.lock、vendor文件夹
2. 进入 mailgun 管理后台，获取 API Key 以及 domain
获取 domain
获取 API Key
3. 使用HTML和文本部分发送消息。此示例还将两个文件附加到邮件中：
# Include the Autoloader (see "Libraries" for install instructions) require 'vendor/autoload.php'; use MailgunMailgun; # Instantiate the client. $mgClient = new Mailgun('YOUR_API_KEY'); $domain = "YOUR_DOMAIN_NAME"; # Make the call to the client. $result = $mgClient->sendMessage($domain, array( 'from' => 'Excited User <YOU@YOUR_DOMAIN_NAME>', 'to' => 'foo@example.com', 'cc' => 'baz@example.com', 'bcc' => 'bar@example.com', 'subject' => 'Hello', 'text' => 'Testing some Mailgun awesomness!', 'html' => '<html>HTML version of the body</html>' ), array( 'attachment' => array('/path/to/file.txt', '/path/to/file.txt') ));
发送成功后如下：
