Properties prop = System.getProperties();
     prop.put("mail.smtp.host", host);
     Session ses1 = Session.getDefaultInstance(prop, null);
     MimeMessage msg = new MimeMessage(ses1);
InternetAddress address = new InternetAddress(from);
// msg.addHeader("X-Priority", "-1");//置优先权
// msg.addHeader("Disposition-Notification-To", "0");//置回执
msg.setFrom(address);
     msg.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
     msg.setSubject("Hello!");
     msg.setText("Test the javaMail!!呵呵");
     Transport.send(msg);