public class MailServlet extends HttpServlet
{
  protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws
  ServletException, IOException
  {
    try {
        sendMail("smtpHost", "user", "pass", "from", "to", "subject","text");
    } catch (Exception e) {
    }
  }

  protected void doGet(HttpServletRequest req, HttpServletResponse resp)
        throws ServletException, IOException
  {}

  public static void sendMail(String smtpHost,String username,String password,String senderAddress,String recipientsAddress,String subject,String text ) throws Exception
  {
    MailAuthenticator auth = new MailAuthenticator(username, password);
    Properties properties = new Properties();
    properties.put("mail.smtp.host", smtpHost);
    properties.put("mail.smtp.auth", "true");
    properties.put("mail.smtp.socketFactory.port", "465");
    properties.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
    Session session = Session.getDefaultInstance(properties, auth);
      Message msg = new MimeMessage(session);
      msg.setFrom(new InternetAddress(senderAddress));
      msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(recipientsAddress, false));
      msg.setSubject(subject);
      msg.setText(text);
      msg.setHeader("Recall", "Recall");
      msg.setSentDate(new Date( ));
      Transport.send(msg);
  }
}

class MailAuthenticator extends Authenticator
{
  private final String user;
  private final String password;
  public MailAuthenticator(String user, String password)
  {
    this.user = user;
    this.password = password;
  }
  protected PasswordAuthentication getPasswordAuthentication()
  {
    return new PasswordAuthentication(this.user, this.password);
  }
}