如何从本地服务器发送邮件？

Question

我在codeigniter中使用smtp，我试过这段代码。

$config = Array(
       'protocol' => 'smtp', 
       'smtp_host' => 'ssl://smtp.googlemail.com', 
       'smtp_port' => 465, 
       'smtp_user' => 'xxx@gmail.com', // change it to yours 
       'smtp_pass' => 'xxx', // change it to yours 
       'mailtype' => 'html', 
       'charset' => 'iso-8859-1', 
       'wordwrap' => TRUE 
      ); 
       $this->load->library('email', $config); 
       $this->email->set_newline('\r\n'); 
       $this->email->from('email@email.com', 'Testing'); 
       $this->email->reply_to('email@email.com', 'Testing'); 
       $this->email->to('email@email.com'); 
       $this->email->cc('email@email.com'); 
       $this->email->subject('Testing'); 
       $this->email->message($message); 
       $this->email->send(); 

但我不明白什么smtp_user和smtp_pass我必须给。任何人都可以联系我！