Abstract: A post mounting apparatus for removably securing the lower end of a post in the ground. The post mounting apparatus comprises a base plate with an upwardly facing socket sized to receive the lower end of the post, the base plate and socket being buried in the ground with an upper end of the socket exposed above ground to receive the post. A cross-piece traversing the interior of the socket and spaced above the lower end of the socket supports the bottom of the post above the bottom of the socket. Internal vertical splines formed on the socket inner wall above the cross-piece engage the lower portion of the post with a snug but easily-removable fit.

Abstract: A system mounts a mailbox to an upstanding post defining an upper portion of the post. The system includes a plate adapted to mount the mailbox and defining a lower surface and an upper surface of the plate, the upper surface being adapted to support a lower surface of the mailbox. A sleeve extends downwardly from the lower surface of the plate, is adapted to matingly receive the upper portion of the post, and defines at least one interior wall of the sleeve. The interior wall defines at least one rib of the interior wall adapted to contact an exterior surface of the upper portion to fittingly secure the post within the sleeve and, thus, mount the mailbox to the post. The sleeve is also adapted to be matingly received by the upper portion of the post. Multiple mailboxes can be supported by a single system.

Abstract: A system mounts a mailbox to an upstanding post defining an upper portion of the post. The system includes a plate adapted to mount the mailbox and defining a lower surface and an upper surface of the plate, the upper surface being adapted to support a lower surface of the mailbox. A sleeve extends downwardly from the lower surface of the plate, is adapted to matingly receive the upper portion of the post, and defines at least one interior wall of the sleeve. The interior wall defines at least one rib of the interior wall adapted to contact an exterior surface of the upper portion to fittingly secure the post within the sleeve and, thus, mount the mailbox to the post. Alternatively, the sleeve is adapted to be matingly received by the upper portion of the post. Alternatively, multiple mailboxes can be supported by a single system.