Spaming CakePHP电子邮件以及如何检查邮件由用户阅读

在CakePHP中使用以下代码，我正在向我的用户发送电子邮件。但是为什么我的电子邮件进入垃圾邮件文件夹和我还想检查用户是否阅读了邮件。怎么可能？

我已经阅读了 http://book.cakephp.org/2.0/en/core-utility-libraries/email.html

在那里，他们说使用"readReceipt"我们可以收到已读的收据。

App::uses('CakeEmail', 'Network/Email');
$Email = new CakeEmail();
$Email->emailFormat('both');
$Email->from(array($webAdminData['User']['email'] => $webAdminData['User']['first_name'].' '.$webAdminData['User']['last_name']));
$Email->replyTo(Configure::read('Email.EmailSupport'),Configure::read('SITE_SETTINGS.Name'));
$Email->sender(array($webAdminData['User']['email'] => $webAdminData['User'['first_name'].' '.$webAdminData['User']['last_name']));
$Email->to($this->request->data['Message']['leadEmail']);
$Email->subject($this->request->data['Message']['subject']);
$Email->send($this->request->data['Message']['body']);                          
$this->Session->setFlash('Message has been sent successfully', 'default', 'success');