A system for mounting to a post including: (1) a mounting surface perpendicular to the post having a planar top side and an opposing bottom side; and (2) a hollow structure extending from the bottom side of the mounting surface and having an interior opening, wherein the hollow structure further includes: (a) a lower end positioned distal the mounting surface, (b) a first lip positioned about a first perimeter of the interior opening, and (c) a second lip positioned about a second perimeter of the interior opening, wherein the length of the first perimeter is greater than the length of the second perimeter, and wherein the first lip is positioned between the second lip and the lower end and the second lip is positioned between the first lip and the mounting surface.

A mailbox impact return system with a spring and controlled rate retraction/contraction device is provided that addresses problems associated with damage to mailboxes/mail-posts caused by the impact of snow. Additionally, the mailbox impact return system is provided that combines flexibility and a return action.

A security package delivery system is provide having at least one wall, a door frame and a door. The door frame is affixed to the at least one wall having a circumferential frame with a door mounting frame inset into a recess relative to a front surface of the door frame. The door has a hinge rod extending through the door frame affixed at each end within a receiving bore of the frame. A method is also provided.