Php 以代码样式而非消息类型接收的电子邮件-Codeigniter

我只是想知道我在gmail账户中收到的是代码，而不是普通的邮件。如果没有代码，我如何接收电子邮件。提前感谢：）

控制器

<?php
class account_login_model extends CI_Model
{
  public function __construct()
  {
    parent::__construct();
    $this->load->database();
  }

  public function login($username, $password)
  {
    $condition_array = array(
      'acc_username' => $username,
      'acc_password' => $password
    );
    $rs = $this->db->get_where('accounts', $condition_array);

    return $rs->row_array() ?: false;
  }

  public function isBlocked($username)
  {
    $condition_array = array(
      'acc_username' => $username,
      'acc_isBlocked' => 1
    );
    $rs = $this->db->get_where('accounts', $condition_array);
    $row_count = count($condition_array);

    if ($row_count > 0) {
      return true;
    } else {
      return FALSE;
    }
  }

  public function block($username)
  {
    $this->load->library('email');

    $email = $this->account_lookup($username, 'acc_email');

    $this->email->from('chicken@chicken.com', 'Student');
    $this->email->to($email);
    $this->email->subject('Account has been blocked');


    $message = $this->load->view('account_blocked', null, TRUE);

    $this->email->message($message);
    $this->email->send();

    $this->db->where('acc_username', $username);
    return $this->db->update('accounts', array('acc_isBlocked' => 1));
  }

 
}

另外，不要忘记发送包含所有必需标记的完整html页面，而不仅仅是子视图。
请将我的答案标记为已接受，以便关闭主题。
$this->load->library('email');
$config['mailtype'] = 'html';
$this->email->initialize($config);