Abstract: A mailbox alert device comprising a flag pole attached to the mailbox; a first pulley disposed near the first end of the flag pole and a second pulley disposed the second end of the flag pole; a circular cable wrapped around the pulleys; a flag attached to the front portion of the cable; a flag stopper attached to the front portion of the cable at the top of the flag; wherein the flag can be moved between an up position and a down position, wherein the flag is biased in the up position caused by a weight attached to the back portion of the cable; tab dispose don the flag for closing in the door of the mailbox, which secures the flag in the down position until the door is opened to deliver mail.