Abstract: A system for illuminating the interior of a mailbox having a bottom wall, a side and arcuate top wall, a closed rear wall, an open front, and a door pivotally attached to the bottom wall for selectively closing the open front. The lighting system includes a light source positioned within the interior of the mailbox. The lighting system further includes a battery power source mounted within the mailbox. A light sensor is positioned within the mailbox for sensing the level of ambient light within the interior thereof. The lighting system includes an electromagnetic sensor that permits current from the power source to be transmitted to the light sensor upon an opening of the mailbox door. If the level of ambient light sensed by the light sensor is below a predetermined level, the light source is energized to illuminate the interior of the mailbox. Current to the light sensor and light source is interrupted upon a closing of the mailbox door.