Yii框架怎么发送邮件？

php composer require --prefer-dist yiisoft/yii2-swiftmailer

return [ 
    //.... 
    'components' => [ 
        'mailer' => [ 
            'class' => 'yii\swiftmailer\Mailer', 
            'viewPath' => '@common/mail', 
            // send all mails to a file by default. You have to set 
            // 'useFileTransport' to false and configure a transport 
            // for the mailer to send real emails. 
            'useFileTransport' => false, 
            'transport' => [ 
                'class' => 'Swift_SmtpTransport', 
                'host' => 'smtp.163.com', 
                'username' => '***@163.com', 
                'password' => '******', 
                'port' => '25', 
                'encryption' => 'tls', 
            ], 
            'messageConfig'=>[ 
                'charset'=>'UTF-8', 
                'from'=>['***@163.com'=>'白狼栈'] 
            ], 
        ], 
    ], 
];

$mail= Yii::$app->mailer->compose();

$mail= Yii::$app->mailer->compose(); 
$mail->setTo('***@qq.com'); //要发送给那个人的邮箱 
$mail->setSubject("邮件主题"); //邮件主题 
$mail->setTextBody('测试text'); //发布纯文字文本 
$mail->setHtmlBody("测试html text"); //发送的消息内容 
var_dump($mail->send());