发送邮件的SMTP协议不能与codeigniter一起使用

$config = Array(
'protocol' => 'smtp',
'smtp_host' => 'smtp.gmail.com',
'smtp_port' => 465,
'smtp_user' => '[email protected]',
'smtp_pass' => 'XXXX',
'mailtype'  => 'html', 
'charset'   => 'iso-8859-1'
);
$this->load->library('email', $config);
$this->email->set_newline("\r\n");

$this->email->from('[email protected]', 'xxxx');
$this->email->to($email);

$this->email->subject('Hi');
$this->email->message('Hi');

if($this->email->send())
{
echo 'Your email was sent.';
}

else
{
show_error($this->email->print_debugger());
}
$config = Array(
'protocol' => 'smtp',
'smtp_ho