My uncle was having that problem in his neighborhood, kids were cruising through about weekly bashing in mailboxes with a baseball bat. He got a piece of 1/4 inch steel rolled to match the inner curve of his new mailbox, then welded it to a piece of flat, slid it inside the box. Then he got a 3" tube 8 feet long, sunk it 4 1/2 feet down and surrounded it with concrete. Bolted the mailbox from the inside to the tube, then made a nice looking casing with wood around the tube to make it look like a 4X4.
The next weekend, 2 neighbors up the road had crushed mailboxes, there was a broken bat next to his... :sidelaugh
Never has happened again in his neighborhood.:fing32:
That new mailbox looks very nice GG, and glad you got to put the deere to work helping out.:thThumbsU
Happy New Year!!!