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

$this->email->from('xxxxx@xxx.com', '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());
}

但它显示错误消息：fsockopen()：无法连接到smtp.gmail.com:465(连接被拒绝).

我在这里看到了解决方案Sending mail with CodeIgniter using SMTP protocol not working,但它无法正常工作,我无法找到php.ini.

解决方法:

我正在使用这种方式,它对我有用：

$config = array(
       'protocol'  =>  'smtps',
       'smtp_host' =>  'ssl://smtps.googlemail.com',
       'smtp_user' =>  DONOT_EMAIL,
       'smtp_pass' =>  EMAIL_PASSWORD,
       'smtp_port' =>  '465',
       'mailtype'  =>  'html',
       'smtp_timeout' => '4',
       'newline'   => "\r\n"
      );

这段代码我用于服务器端.
每次在本地或服务器中使用邮件功能时,请确保.像这样初始化：

$this->email->initialize($config);