CI框架 Email类 使用QQ企业邮箱发件失败

$config['protocol']  = $this->ci->config->item('email_protocol');
$config['smtp_host'] = $this->ci->config->item('email_smtp_host');
$config['smtp_user'] = $this->ci->config->item('email_smtp_user');
$config['smtp_pass'] = $this->ci->config->item('email_smtp_pass');

$config['crlf'] = "\n";
$config['newline'] = "\n";

$config['crlf'] = "\r\n";
$config['newline'] = "\r\n";