email-access-gmail-open-delete.java

IMAPFolder folder = null;
        String[] folders = new String[]{"INBOX", "[Gmail]/Spam"};

        for (String fname : folders) {

            folder = (IMAPFolder) store.getFolder(fname);
            folder.open(Folder.READ_WRITE);
            int c = folder.getMessageCount();
            System.out.println(c);

            Map map = new HashMap<>();
            for (int i = c; i > 0; i--) {

                Enumeration
 headers = message.getAllHeaders();

                while (headers.hasMoreElements()) {
                    Header h = headers.nextElement();
                    //h.getName()
                    //h.getValue()

                 }

                if (message.isSet(Flags.Flag.SEEN)) {
                message.setFlag(Flags.Flag.DELETED, true); //mark this message as deleted
                }

            }
        }
        folder.expunge(); //
        folder.close(true);