The fastest mate!

In the kings pawn opening of the correspondence chess game I played and lost a game which was most embarasment and I cannot think how i lost that game that was fastest 8 moves mate that is  1.e4 e5 2. Nf3 Nc6 3. Bc4 Be7 4. d4 exd4  5. Nxd4 Nxd4 6. Qxd4 d6 7. Qxg4 Bf6 8. Qxf7#.