Recently I bought a new mailbox: 99,9% copper, anti-something-or-other paint, and a silver bugle ornament on the front.
Being a sceptic, I didn't expect what happened, but I have to believe my own senses:
My bills have dropped with approximately 10%, the letters from my creditors have changed from ugly threats to reasonable suggestions, and my wealthy great aunt is sending postcards with invitations to tea. Also, while I used to find the loads of advertising leaflets a nuisance, these are now an aesthetically pleasing experience.
The vendor suggest to add a lithium stand with teflon fittings, to improve my mail even more -- and I think I'll go for it.