// code.calum.org

    public void sendEmail(String to, String from, String subject, String message, Throwable e) {
        try {
            StringWriter sw = new StringWriter();
            PrintWriter pw = new PrintWriter(sw);
            e.printStackTrace(pw);
            if ( message != null ) {
                sendEmail(to, from, subject, message + ":\n" + sw.toString());
            } else {
                sendEmail(to, from, subject, sw.toString());
            }
        } catch ( Exception ex) {
            logger.error("", ex);
        }
    }

    public void sendEmail(String to, String from, String subject, String message) {
        try {
            SimpleMailMessage simpleMailMessage = new SimpleMailMessage();
            simpleMailMessage.setTo(to);
            simpleMailMessage.setFrom(from);
            simpleMailMessage.setSubject(subject);
            simpleMailMessage.setText(message);

            mailSender.send(simpleMailMessage);
            logger.info("Email sent to " + to + ", subject " + subject);
        } catch (Exception e) {
            logger.error("", e);
        }
    }