messages = response.get('messages', [])
    email_list = []

    for msg in messages:
        msg_id = msg['id']
        message = service.users().messages().get(userId='me', id=msg_id, format='full').execute()
        payload = message.get('payload', {})
        headers = payload.get('headers', [])

        subject = next((h['value'] for h in headers if h['name'] == 'Subject'), '')
        body = get_message_body(payload)
        full_text = f"{subject} {body.strip()}"

        prediction = predict(model, full_text)

        add_labels = [label_spam if prediction == 'spam' else label_ham]
        remove_labels = [label_test]

        service.users().messages().modify(
            userId='me',
            id=msg_id,
            body={
                'addLabelIds': add_labels,
                'removeLabelIds': remove_labels
            }
        ).execute()

        print(f"[ZMIANA] Wiadomość '{subject[:40]}...' → {prediction.upper()} (etykieta zmieniona)")