An assembly for a door or wall having a mail slot therein includes a mounting portion and a flap portion. The flap portion is sized to cover the mail slot. A connector is mountable on the door or wall around the slot. A cooperable connector is integral with the flap portion for releasably connecting with the connector. The connector includes one of a ferrous material containing portion and a magnetic portion. The cooperable connector includes the other of the ferrous material containing portion and the magnetic portion. The flap portion is magnetically connectable to the door or wall around the mail slot opening.