Forwarding email in Java

We can forward the received mail to someone else as we send emails. There are many javamail classes that are used to forward the messages to the destination resource.

For better understanding of this example, learn the steps of sending email using JavaMail API first.

For receiving or sending the email using JavaMail API, you need to load the two jar files:

mail.jar
activation.jar

download these jar files (or) go to the Oracle site to download the latest version.

Example of forwarding email in Java

import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;

public class ForwardMail{
 public static void main(String[] args)throws Exception {
  final String user="sonoojaiswal@javatpoint.com";//change accordingly
  final String password="xxxxx";//change accordingly


  //get the session object
  Properties props = new Properties();
  props.put("mail.smtp.host", "mail.javatpoint.com");
  props.put("mail.smtp.auth", "true");

  Session session = Session.getDefaultInstance(props,
    new javax.mail.Authenticator() {
	protected PasswordAuthentication getPasswordAuthentication() {
        return new PasswordAuthentication(user,password);
	}
  });
 
		
  // Get a Store object and connect to the current host 
  Store store = session.getStore("pop3");
  store.connect("mail.javatpoint.com",user,password);

  //Create a Folder object and open the folder
  Folder folder = store.getFolder("inbox");
  folder.open(Folder.READ_ONLY);
  
  Message message = folder.getMessage(1);

  // Get all the information from the message
  String from = InternetAddress.toString(message.getFrom());
  if (from != null) {
  System.out.println("From: " + from);
  }
  String replyTo = InternetAddress.toString(
  message.getReplyTo());
  if (replyTo != null) {
  System.out.println("Reply-to: " + replyTo);
  }
  String to = InternetAddress.toString(
  message.getRecipients(Message.RecipientType.TO));
  if (to != null) {
  System.out.println("To: " + to);
  }

  String subject = message.getSubject();
  if (subject != null) {
  System.out.println("Subject: " + subject);
  }
  Date sent = message.getSentDate();
  if (sent != null) {
  System.out.println("Sent: " + sent);
  }
  System.out.println(message.getContent());

  // compose the message to forward
  Message message2 = new MimeMessage(session);
  message2.setSubject("Fwd: " + message.getSubject());
  message2.setFrom(new InternetAddress(from));
  message2.addRecipient(Message.RecipientType.TO,
  new InternetAddress(to));

  // Create your new message part
  BodyPart messageBodyPart = new MimeBodyPart();
  messageBodyPart.setText("Oiginal message:\n\n");

  // Create a multi-part to combine the parts
  Multipart multipart = new MimeMultipart();
  multipart.addBodyPart(messageBodyPart);

  // Create and fill part for the forwarded content
  messageBodyPart = new MimeBodyPart();
  messageBodyPart.setDataHandler(message.getDataHandler());

  // Add part to multi part
  multipart.addBodyPart(messageBodyPart);

  // Associate multi-part with message
  message2.setContent(multipart);

  // Send message
  Transport.send(message2);

  System.out.println("message forwarded ....");
  }
} 
	

download this example to forward the email

As you can see in the above example, we are able to forward the email to the destination resource. Now run this program by :

Load the jar file	c:\> set classpath=mail.jar;activation.jar;.;
compile the source file	c:\> javac ForwardMail.java
run by	c:\> java ForwardMail

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