function send_email(){
        $this->load->library('Phpmailer_library');
        $mail = $this->phpmailer_library->load();

        // SMTP configuration
        $mail->isSMTP();
        $mail->Host     = 'mail.bantuanteknis.org';
        $mail->SMTPAuth = true;
        $mail->SMTPAutoTLS=false;
        $mail->Username = 'ementoring@bantuanteknis.org';
        $mail->Password = 'p3g3lnajarS';
        $mail->Port     = 26;

        $mail->setFrom('ementoring@bantuanteknis.org', 'Ementoring');
        $mail->addAddress('munazarbunda@gmail.com');
        $mail->Subject = 'coba';
        $mail->isHTML(true);
        $mail->Body = 'tes';

        if ($mail->send()) {
            //all ok
        } else {
            $error_message = $mail->ErrorInfo;
            print_r($error_message);
        }
    }