function deliver_mail() {
             //name of button
        require_once "C:/xampp/htdocs/WP/wp-includes/class-phpmailer.php";

        // sanitize form values
        $name    = sanitize_text_field( $_POST["name"] );
        $email   = sanitize_email( $_POST["email"] );
        $subject = sanitize_text_field( $_POST["subject"] );
        $message = esc_textarea( $_POST["message"] );
        // get the blog administrator's email address
        //$d = ($_POST["hidden"]);
        $headers = "From: $name <$email>" . "\r\n";

        // Localhost
        $mail = new PHPMailer(true);
        $mail->IsSMTP(); // telling the class to use SMTP
        $mail->CharSet = 'UTF-8';

        $mail->SMTPDebug = 0;                     // enables SMTP debug information (for testing)
        $mail->SMTPAuth = true;                  // enable SMTP authentication
        $mail->SMTPSecure = "ssl";                 // sets the prefix to the servier
        $mail->Host = "mail.gmx.com";      // sets GMX as the SMTP server for example: mail.gmx.com
        $mail->Port = 465;                 // set the SMTP port for the GMX server


        $mail->Username = $email;
        $mail->Password = 'pass';

        $mail->SetFrom($email, $name);
        $mail->AddAddress($instance['email']);
        //Here has to be accessed $instance['email'] variable from the form() function;

        $mail->Subject = $subject;
        $mail->MsgHTML($message);

        $headers .= "Content-Type: text/html; charset=utf-8";
        $headers .= "Content-Transfer-Encoding: 8bit";

        try {
            $mail->send();
            $msg = "An email has been sent for verfication.";
            $msgType = "success";


        } catch (Exception $ex) {
            $msg = $ex->getMessage();
            $msgType = "warning";

        }

        die();
            }