private function getNewMailer($email = '')
    {
        $mail = new PHPMailer();
        $mail->isSMTP(); // Set mailer to use SMTP
        $mail->Host = 'smtp.mandrillapp.com'; // Specify main and backup SMTP servers
        $mail->SMTPAuth = true; // Enable SMTP authentication
        $mail->Username = 'smtp username'; // SMTP username
        $mail->Password = 'smtp-password'; // SMTP password
        $mail->SMTPSecure = 'tls'; // Enable TLS encryption, `ssl` also accepted
        $mail->Port = 587; // TCP port to connect to
        $mail->CharSet = 'utf-8';

        $mail->From = ADMIN_EMAIL;
        $mail->FromName = BLOG_TITLE;

        if (is_string($email)) {
            $mail->addAddress($email);
        } else if (is_array($email)) {
            foreach ($email as $e) {
                $mail->addAddress($e);
            }
        }
        return $mail;
    }