Built a new mailbox, and filled the old mailslot with spray foam. During the winter we used to get some brutal cold air through it. The rest of the house is 100 years old, so the front door is also drafty, but fixing that will take more time.
Materials are solid walnut for 5 sides, and a 3/4" plywood back. I was concerned about wood movement, since this is going to live outside, so I used the plywood to hopefully off set some of that, and attached the other sides to the plywood with dowels and glue.
Finish is 4 coats of General Finish's 450 exterior via a HVLP spray gun.
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