首先，先在application/config文件夹下建立一个文件，名为：email.php，内容如下：
if( ! defined('BASEPATH'))exit('No direct script access allowed');
$config['protocol'] ='smtp';
$config['smtp_host'] ='smtp地址';
$config['smtp_user'] ='smtp账户';
$config['smtp_pass'] ='smtp密码';
$config['smtp_port'] ='25';
$config['charset'] ='utf-8';
$config['wordwrap'] = TRUE;
$config['mailtype'] ='html';
然后再要发送邮件的地方加入：
$this->load->library('email');
$this->email->from('smtp账户','Q-blog');
$this->email->to('test@qq.coom');//发送给谁
$this->email->cc('test@163.com');//抄送
$this->email->attach('images/test.jpg');//附件
$this->email->subject('test email title');//邮件标题
$this->email->message('test email content'); //邮件内容
$this->email->send();//发送
