邮件发送问题 [ 未指定版本 ]

    $user_mail = "test@qq.com";
    $user_name = "passwords";
    $send_name = "test@qq.com";
    $mailer = \Yii::$app->mailer;
    $mailer->transport = $mailer->transport->newInstance('smtp.qq.com', 465, 'ssl');
    $mailer->transport->setUsername($user_mail);
    $mailer->transport->setPassword($user_name);
    $compose = $mailer->compose('setMail', [
        'store_name' => "1",
        'goods_list'=>"测试",
    ]);
    $compose->setFrom($user_mail); //要发送给那个人的邮箱
    $compose->setTo($send_name); //要发送给那个人的邮箱
    $compose->setSubject("测试邮件"); //邮件主题
    $res = $compose->send();
    
    我使用这个发送邮件，在本地测试时可以发送的，但是放到服务器上就发送不成功，提示：Connection could not be established with host smtp.qq.com [ #0]
    求助：这是怎么回事？