JAVA MAIL API

message.setFlag(Flags.Flag.DELETED, true);

folder.open(Folder.READ_WRITE);

package R4R;
import java.io.*;
import javax.mail.*;
import javax.mail.internet.*;
public class deletemail{
 public static void main (String args[]) throws Exception {
 String host = args[0];
 String username = args[1];
 String password = args[2];
 // Get session
 Session session = Session.getInstance(
 System.getProperties(), null);
 // Get the store
 Store store = session.getStore("pop3");
 store.connect(host, username, password);
 // Get folder(追記) (追記ここまで)
 Folder folder = store.getFolder("INBOX");
 folder.open(Folder.READ_WRITE);
 BufferedReader reader = new BufferedReader (
 new InputStreamReader(System.in));
 // Get directory
 Message message[] = folder.getMessages();
 for (int i=0, n=message.length; i<n; i++) {
 System.out.println(i + ": " + message[i].getFrom()[0] 
 + "\t" + message[i].getSubject());
 System.out.println("Do you want to delete message? [YES to delete]");
 String line = reader.readLine();
 // Mark as deleted if appropriate
 if ("YES".equals(line)) {
 message[i].setFlag(Flags.Flag.DELETED, true);
 }
 }
 // Close connection 
 folder.close(true);
 store.close();
 }
}