Why not make something from wood?

Whenever I see something about through-the-wall mail slots I remember when our neighborhood's "bad seed kid" disconnected our next-door neighbor's hose from its sprinkler and stuck the hose into their mail slot. Or the Halloween that some jerk pushed dog poop into ours.

jon1270 is on the right track. Why not get your mail slot, then build a box out of some 1/4 or 1/2" birch or other decent wood. Cut a hole into which you can fit that box and nail it into a stud on one side. Then insert the inner and outer mail slots over that. It will be smooth enough for mail to slide in.

I took my mail slot out. Too cold in the winter.

I got a nice big locking mail box, outside the front door.

Works great.

Scott

Thanks everyone for your responses.
I decided to take the easy way out and just installed a wall mounted mail box near the front door. It works!