'components' => [

        'mailer' => [

            'class' => 'yii\swiftmailer\Mailer',

            'viewPath' => '@common/mail',

            'useFileTransport' => false,

            'transport' => [

                'class' => 'Swift_SmtpTransport',

                'host' => 'smtp.163.com',

                'username' => '00000@163.com',

                'password' => '00000000',

                'port' => '25',

                'encryption' => 'tls',

            ],

        ],

    public function actionSendMail()

    {

        $content = "<div><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p><p>XXXXXXXXX</p></div>";

        \Yii::$app->mailer->compose()

            ->setFrom('00000@163.com')

            ->setTo('00000@qq.com')

            ->setSubject('TEST')

            ->setTextBody('测试')

            ->setHtmlBody($content)

            ->send();

    }