How to Create Mime Message in java

import java.util.Properties;

import javax.mail.Address;
import javax.mail.Message;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class MainClass {

public static void main(String[] args) throws Exception {

Properties props = new Properties();
props.put("mail.host", "mail.cloud9.net");

Session mailConnection = Session.getInstance(props, null);
Message msg = new MimeMessage(mailConnection);

Address a = new InternetAddress("a@a.com", "A a");
Address b = new InternetAddress("fake@java2s.com");

msg.setContent("Mail contect", "text/plain");
msg.setFrom(a);
msg.setRecipient(Message.RecipientType.TO, b);
msg.setSubject("subject");

Transport.send(msg);
}
}