Abstract: A mailbox comprises a hollow, closed body having an open end with a door pivotally mounted therein. A rigid mounting sleeve, formed integrally and in one piece with the body, depends from the base of the mailbox and is shaped to telescopingly receive a support post therein to securely mount the mailbox and its contents at a desired location. The door preferably has a recessed handle and a recessed signal flag pivotally mounted in the exterior face of the door.