When Joe Clueless starts receiving $200 bills from his ISP because of all those spams he's unwittingly sending us, maybe he'll start paying attention to security.

Other Cringe readers offered technical solutions -- like encouraging ISPs to employ Sender Policy Framework and use Reverse MX lookups to spot forged sender addresses.

Regular commentor ticedoff8 suggests we hand over our email systems to a third party so that they can enforce anti-spam rules:

To solve this problem, someone has to "own" the routing and transport system. This new system would have to be secure and require some form of authorization to access (put mail into the pipe). ...This "owner" of this new transport & routing system would establish criteria for relationships with ISPs. If the ISP violates their contracts - boom, the hammer drops and the ISP is cut off.

As he (she?) notes, you'd have to give up notions of a free and open Internet and Net neutrality to make such a system work. And then there's the possibility of somebody just bribing their way onto that third party's permanent whitelist.