Google AppEngine - sending e-mail in Java

import java.io.UnsupportedEncodingException;

import java.util.Properties;

import javax.mail.Message;

import javax.mail.Message.RecipientType;

import javax.mail.MessagingException;

import javax.mail.Session;

import javax.mail.Transport;

import javax.mail.internet.InternetAddress;

import javax.mail.internet.MimeMessage;

public class MailExample {

  public void sendMail() {

    Properties props = new Properties();

    Session session = Session.getDefaultInstance(props, null);

    String messageBody = "body";

    String messageSubject = "Subject";

    try {

      Message msg = new MimeMessage(session);

      // I think sender address must match the user that runs the Google AppEngine application

      InternetAddress sender = new InternetAddress("sender@example.com", "John Smith");

      InternetAddress receiver = new InternetAddress("receiver@example.com", "Receiver Smith");

      InternetAddress receiverCC = new InternetAddress("cc@example.com", "Cc Smith");

      msg.setFrom(sender);

      msg.addRecipients(RecipientType.CC, new InternetAddress[] {receiverCC});

      msg.addRecipient(Message.RecipientType.TO, receiver);

      msg.setSubject(messageSubject);

      msg.setText(messageBody);

      Transport.send(msg);

    } catch (MessagingException e) {

      throw new RuntimeException("Networkconnection problem", e);

    } catch (UnsupportedEncodingException e) {

      throw new RuntimeException("Invalid e-mail address", e);

    }

  }

}