Abstract: A mailbox delivery signal device comprises a signal ball of aerodynamic configuration tethered to a support bracket mounted to the door of the mailbox. The support bracket includes a planar support member which extends perpendicular to the mailbox door and includes a circular hole formed therethrough having a diameter smaller than the diameter of the signal ball. The signal ball is tethered to the support bracket and is seated thereon in the circular hole to set the device. Upon opening the door, the ball falls from the bracket and is suspended by the tether below the mailbox housing for clear viewing by a person located remotely therefrom.