如何从Yii的联系表格发送电子邮件？

Question

我想从Yii框架中的简单联系表单发送电子邮件，这是我第一次处理这样的案例，这是我的代码：

public function actionContact()
    {
        $model=new ContactForm;
        if(isset($_POST['ContactForm']))
        {
            $model->attributes=$_POST['ContactForm'];
            if($model->validate())
            {
                $name='=?UTF-8?B?'.base64_encode($model->name).'?=';
                $subject='=?UTF-8?B?'.base64_encode($model->subject).'?=';
                $headers="From: $name <{$model->email}>\r\n".
                    "Reply-To: {$model->email}\r\n".
                    "MIME-Version: 1.0\r\n".
                    "Content-type: text/plain; charset=UTF-8";
ini_set("SMTP","mail.patrahr.com");

ini_set("smtp_port","25");

                mail(Yii::app()->params['info@patrahr.com'],$subject,$model->body,$headers);
                Yii::app()->user->setFlash('contact','Thank you for contacting us. We will respond to you as soon as possible.');
                $this->refresh();
            }
        }
        $this->render('contact_1',array('model'=>$model));
    }

但是我收到了一个错误： mail(): SMTP server response: 550 Access denied - Invalid HELO name (See RFC2821 4.1.1.1)

那为什么会出现这个错误？