网络选摘之邮件转发

假设A发信给B,同时CC给C,D
B把邮件转发给E

实现下面的功能
当E看到邮件的时候From是A, TO是E, CC是C,D
当然，C,D应该只收到第一次A发给他们的信，转发的不能到达。
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d这个问题就是伪造邮件了。javamail可以实现地址的伪造。
MimeMessage msg=new MimeMessage(session);
msg.setFrom(new InternetAddress(from));
B把邮件转发给E时，把from的地址设置为A的不就可以了吗

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/*
 * 作成日: 2005/11/18
 */
import java.util.Properties;

import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Store;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;

/**
 * @author Croatia
 */
public class Test8 {

static int attachnum = 1;

public static void main(String args[]) {
try {
String host = "xxx.xxx.xxx.xxx";
String user = "xxxxxx";
String password = "xxxxxx";

Session session =
Session.getDefaultInstance(System.getProperties(), null);
Store store = session.getStore("pop3");
store.connect(host, -1, user, password);

Folder folder = store.getFolder("INBOX");
folder.open(Folder.READ_WRITE);

int totalMessages = folder.getMessageCount();
if (totalMessages == 0) {
System.out.println("没有?件");
folder.close(false);
store.close();
return;
}

Message[] messages = folder.getMessages();
for (int i = 0; i < messages.length; i++) {
sendMail(messages[i]);
//messages[i].setFlag(Flags.Flag.DELETED, true);
}

//folder.close(true);
folder.close(false);
store.close();
} catch (Exception e) {
e.printStackTrace();
}
}

public static void sendMail(Message m) throws Exception {
try {

Properties props = System.getProperties();
props.put("mail.smtp.host", "XX.XX.XX.XX");
Session session = Session.getDefaultInstance(props, null);

// Create the message to forward
MimeMessage forward = new MimeMessage(session);

// Fill in header
forward.setSubject(m.getSubject());

forward.setFrom(m.getFrom()[0]);
forward.addRecipient(
Message.RecipientType.TO,
new InternetAddress("[e-mail]","周","GB2312"));

InternetAddress[] oAddress = (InternetAddress[])m.getRecipients(Message.RecipientType.CC);
if (oAddress != null){
for (int j=0;j<oAddress.length;j++){
forward.addRecipient(
Message.RecipientType.CC,
new InternetAddress(oAddress[j].getAddress(),oAddress[j].getPersonal()));
}
}

// Create your new message part
MimeBodyPart messageBodyPart = new MimeBodyPart();
//messageBodyPart.setText("Here you go with the original message:/n/n","iso-2022-jp");

// 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(m.getDataHandler());

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

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

// Send message
Transport.send(forward);

} catch (Exception e) {
e.printStackTrace();
}
}
}