Spanakopita with leeks and feta cheese

1kg of fresh or frozen spinach roughly cut, 2 onions roughly chopped, 3 leeks roughly chopped, 1 pack of country style fyllo (6 layers), 3 handfulls of roughly chopped dill, 3 eggs roughly beaten, 350 gr of feta cheese, 3-5 tablespoons of grated hard greek cheese, salt & pepper, olive oil.