@Named
@Stateless
public class MailerBean {
    @Resource(name="mail/myExampleSession")
    private Session session;
    private static final Logger logger =
            Logger.getLogger(MailerBean.class.getName());

    @Asynchronous
    public Future<String> sendMessage(String email) {
        String status;
        try {
            Properties properties = new Properties();            properties.put("mail.smtp.port", "3025");            session = Session.getInstance(properties);                        Message message = new MimeMessage(session);
            message.setFrom();
            message.setRecipients(Message.RecipientType.TO,
                    InternetAddress.parse(email, false));
            message.setSubject("Test message from async example");
            message.setHeader("X-Mailer", "JavaMail");
            DateFormat dateFormatter = DateFormat
                    .getDateTimeInstance(DateFormat.LONG, DateFormat.SHORT);
            Date timeStamp = new Date();
            String messageBody = "This is a test message from the async "
                    + "example of the Java EE Tutorial. It was sent on "
                    + dateFormatter.format(timeStamp)
                    + ".";
            message.setText(messageBody);
            message.setSentDate(timeStamp);
            Transport.send(message);
            status = "Sent";
            logger.log(Level.INFO, "Mail sent to {0}", email);
        } catch (MessagingException ex) {
            logger.severe("Error in sending message.");
            status = "Encountered an error: " + ex.getMessage();
            logger.severe(ex.getMessage());
        }
        return new AsyncResult<>(status);
    }
}