Abstract: A secured mailbox assembly for preventing the theft of mail placed inside a user's mailbox. The secured mailbox assembly includes an elongate base member being adapted to be partially disposed in a ground; and also includes a mailbox including a bracket being fastened with fasteners to the elongate base member, and also including a container being attached to the bracket, and further including a mail delivery door being hingedly attached to the container, and also including a mail retrieval door also being hingedly attached to the container, and further including a mail chute being attached to the mail delivery door; and further includes a lock mechanism for locking the mail receiving door to said container.