Nope. Its possible to clog a e-mail box for free. It would cost lots of money to do the same kind of attack on a physical box. Lastly, the mailman would stop it. Nobody gonna stop me from spasming Daniel K. Pelosi.
> It would cost lots of money to do the same kind of attack on a physical box.
Find a couple of professional magazines. Find the "response card" in that magazine. Fill it with victim's name and real world mail address. Tick 10 boxes. Repeat this a few times. (Wear gloves when doing this and carefully destroy the magazines afterwards.) This is free for the person doing it. It's low cost for each company involved.
> the mailman would stop it.
Why would a postal worker not deliver post with a valid name and address?
You've just taken this to a whole new level. Should mailbait be extended to pair name/address with forms online? I could modify my woodburning stove and heat my house... think how much energy i'd be saving and not have to draw from a coal-fired powerplant!
Find a couple of professional magazines. Find the "response card" in that magazine. Fill it with victim's name and real world mail address. Tick 10 boxes. Repeat this a few times. (Wear gloves when doing this and carefully destroy the magazines afterwards.) This is free for the person doing it. It's low cost for each company involved.
> the mailman would stop it.
Why would a postal worker not deliver post with a valid name and address?