A classic US rural/residential mailbox, in unpainted grey, standing on plain crossed wooden posts. When placing mailbox next to a driveway, make sure that the right side (the side with the flag) is facing the driveway.
Feel free to reskin this mailbox at your leisure. Just make sure you follow the terms of my license.
UPDATE 5/25/08: Welded some vertices together, decreasing polys and fixing texturing. Enjoy!