How to cease and desist Google Adwords snail mail?

I get periodic snail mail offering Adwords discounts. I don't want it.

[albo]

I do not see a transaction for this on the Google website. I do not see a transaction for this on my hosting company's website. I receive periodic snail mail offering a certain credit for Adwords if I spend a certain amount more for these "small business websites". I am not interested in using Google Adwords for these websites, nor will I ever be. These mailings are a waste of human time, paper, and fossil fuel in printing and delivery. How do I stop them?

[lucy24]

Can you identify them before opening them? If so, there's always "refused-- return to sender". People tend to notice actions that require them to take some physical action in return. Outgoing mail is automated; incoming requires a human.

[albo]

Always easy to identify: it's the *only* snail mail I get "from" my hosting company.

Okay. I'll try it, much as I hate to put the USPS to extra needless effort. (After all, the poor blokes are going broke!) But maybe in the long run it'll be a boon to the USPS.

I must say, though, that this has never worked with e.g. Capital One. (And neither has sending their stuff back to them postage-paid.)