Abstract: A roadside mailbox mail delivered indicator is formed by a base flatly attachable to the horizontal top of the mailbox adjacent its door closed end opening, including a planar signal panel pivotly connected to one end of an upstanding portion of the base. A latch tip on the end portion of the signal panel opposite its hinged connection with the base, maintains the signal panel in a horizontal forward position by the mailbox door flange overriding the tip to hold the signal panel in a first cocked position. Opening the mailbox door releases the signal panel to a gravity pivoted upright second position for indicating mail delivery by the postman.