为什么有时候我的邮件没有加载他们的地址?

我的应用程序在客户购买时发送一封确认电子邮件。8/10发送正常，但2/10返回一个错误消息，说电子邮件地址丢失，无法发送。

我已经检查了提供电子邮件的SESSION，它似乎工作得很好。我想知道是否有可能在配置或代码的东西，可以调整，以解决问题。

Many Thanks !

这是我现有的配置/代码:

 <?php
$config['wrapchars'] = '76';
  $config['mailtype'] = 'html';
  $config['wordwrap'] = TRUE;
  $config['crlf'] = "'r'n";
  $config['newline'] = "'r'n";
  $this->email->initialize($config);
  $templates = $this->MEmail->getEmailTemplate('2'); 
  $email = $_SESSION['email'];
  foreach($templates->result() as $row)
  {$message = $row->Contents;
   $templatename = $row->Name;
  }
  $pickupdate = $_POST['pickupdate'];
  $pickuplocation = $_POST['location'];
  $start_time=$data['times']['start_time'];
  $endtime=$data['times']['endtime'];
  $data = array(
               'heading' => 'Country Lane Farms: Your Order Details',
               'message' =>$message,
      'firstname' => $_SESSION['firstname'],
           'lastname' => $_SESSION['lastname'],
      'order_num' => $_SESSION['order_num'],
      'totalprice' => $_SESSION['totalprice'],
      'orders'=> $_SESSION['cart'],
      'pickupdate' => $pickupdate,
      'pickuplocation'=> $pickuplocation,
      'start_time' => $start_time,
      'endtime' => $endtime
          );

   $html = $this->load->view('/templates/confirm_order.php',$data, TRUE);
   $this->email->clear();
   $this->email->from('orderdesk@countrylanefarms.com', 'Country Lane Farms (Jerry)');
   $this->email->to($email);
   $this->email->subject($templatename);
   $this->email->message($html); 
   $this->email->send();
?>