JavaMail flagging problems

Hi everyone, I am working on receiving a mail currently. I use a substring "status" to search for the mail's subject line and read only those mails which have this as the subject line.
My problem is, every time i run the program, the old mails are also displayed. how to flag the mails as 'read' and read only the unread mails the next time i run the program... ? here is my source code.

import java.util.*;
import java.io.*;
import javax.mail.*;
import javax.mail.search.*;


public class MessageRead {

public static void receive(String smtpHost, String user,
String password, String subjectSubstringToSearch){
Session session = Session.getInstance(new Properties());

try {
Store store = session.getStore("pop3");
store.connect(smtpHost, user, password);
// Get "INBOX"
Folder folder = store.getFolder("INBOX");
folder.open(Folder.READ_WRITE);
int count = folder.getMessageCount();
System.out.println(count + " total messages");

// Search for e-mails by some subject substring
String pattern = subjectSubstringToSearch;
SubjectTerm subterm = new SubjectTerm(pattern);
Message [] found = folder.search(subterm);

System.out.println(found.length +
" messages matched Subject pattern \"" +
pattern + "\"");

for (int integer = 0; integer < found.length; integer++) {
Message message = found[integer];
Date date = message.getSentDate();
Address [] from = message.getFrom();
String subj = message.getSubject();
String mimeType = message.getContentType();
System.out.println(date + "\t" + from[0] + "\t" +
subj + "\t" + mimeType);
//here add the code for flagging


/*if (message[i].isSet(Flags.Flag.SEEN)) {
System.out.println("Read");
} */
Object o = message.getContent();
if (o instanceof String) {
System.out.println("--This is a String Body part--");
System.out.println((String)o);
}
else if (o instanceof Multipart) {
System.out.println("--This is a Multipart Message--");
Multipart multipart = (Multipart)o;
int count3 = multipart.getCount();
System.out.println("It has " + count3 +
" BodyParts in it!");
for (int j = 0; j < count3; j++) {
BodyPart b = multipart.getBodyPart(j);
/*System.out.println( "BodyPart " + (j + 1) +
" is of MimeType " + mimeType); */

Object o2 = b.getContent();
if (o2 instanceof String) {
System.out.println("--This the mail's Body--");
System.out.println((String)o2);
}

}
}


}

folder.close(true);
store.close();

}
catch (MessagingException messageexception) {
messageexception.printStackTrace();
}
catch (IOException ioexception) {
ioexception.printStackTrace();
}

}

public static void main(String[] args) {
receive("mail.emailsrvr.com", "vidya_n@xyz.net",
"passwrd", "Status");
}
}