This mailbox post with support beams on all sides extends around the outside of the hole and should be installed using a level to ensure the post is straight. It sholud be planted at least two feet deep and it is corrosion and pest resistant. For all rural mailboxes some assembly required.

Alexandria Moulding 72 in. H x 4 in. D x 4 in. W Natural Pine Mailbox Post
$38.73