Abstract: An elongated rod having a means of signal attached to one end thereof. The opposite end is circular shaped to create a tension spring with its end tip hooked to rest against the bottom of mailbox door, that being the mailbox has a vertically swinging hinged door. The elongated rod is equipped with an attachment housing centered to pivot and swing as it is affixed to the side bottom of the mailbox by one screw only, to work as a cam. The hook is set or placed to the outside bottom of the door so it will disengage when the door is opened allowing the spring end to drop vertically to bring the signal end to an upstanding second position. After the door is re-closed the rod is manually re-engaged to first position by placing hook end against the mailbox door.