A mail alert signaling device for use with a mailbox having a housing and door for receiving mail said device being attached at one of its ends to the exterior of the mailbox and having a signaling portion on the other end wherein an L-shaped member of the signaling portion reversibly couples with a lip portion on the mailbox to configure the device in standby mode, and when the door is opened die L-shaped member is dislodged from the lip portion thereby signaling mail delivery.