Abstract: A theft-resistant mailbox with secure mounting bracket and method of construction thereof are presented. A mounting bracket is formed and includes a substantially flat plate provided with one or more apertures to accommodate at least one post fastener. A housing having an open substantially rectangular bottom is provided. A bottom plate is fixedly attached to the inside walls of the housing above bottom margins of the rectangular bottom. A bracket mount is provided between the bottom margins to be slidably received by the mounting bracket over the post fastener. A lockable door is pivotably attached to a front of the housing. A bracket lock is provided to removably lock the mounting bracket to the housing from at least one fixed point of attachment accessible from within the housing.