使用codeigniter发送简单的电子邮件

我正尝试使用codeigniter发送简单的电子邮件，如解释此链接 codeigniter电子邮件类别，但是不起作用。
这是我的表单：

I am trying to send simple email using codeigniter as explain this link codeigniter email class ,but it doesn't work. This is my form :

<form method="post" action="<?php base_url()?>main/send_email">
               <input type="text" placeholder="Name" name="name" class="name">
               <input type="text" placeholder="Surname" name="surname" class="surname">
               <input type="email" placeholder="email" name="email" class="email">
               <textarea placeholder="What's on your mind" name="text" class="text"></textarea>
               <input type="submit" value="SEND" class="send_mail" name="send_mail">
</form>

这是我的控制者

  <?php
    defined('BASEPATH') OR exit('No direct script access allowed');

   class Main extends CI_Controller {
     public function __construct(){
     parent::__construct();
     $this->load->helper("common_helper");

    date_default_timezone_set('Asia/Tbilisi');
 }

public function index()
{

    $this->load->view('pages/main');
}

public function send_email()
{
    $this->load->library("email");
    if($this->input->post("send_mail"))
    {
        $name = $this->input->post("name");
        $surname = $this->input->post("surname");
        $email = $this->input->post("email");
        $text = $this->input->post("text");
         $this->email->from($email, $name);
         $this->email->to('77vanich77@gmail.com');
         $this->email->subject('Email Test');
         $this->email->message('testing email message');

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


 }
}

我没有任何错误。