Now that I think about it, all public email addresses are susceptible to the exact same problems of physical mailing addresses. Anyone can send anyone anything. Unfortunately it's as if online life has the same pitfalls of real life.
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!