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 ....");     }   }           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