Sadly, but needed, email traffic is gonna be 'reversed'. I.e. as you know the "remove me from list" today, a built in software on ISP mailservers will send back a reply where the sender has to confirm manually with a generated code in a small image (add me to your safelist). You already see this on website forms today. That means you have to have a valid email and use the same email to send again to get through the filters. The users can choose to use the filter or not, and instead of blocking senders, he can choose which emails to be on safelist. When signing up for emails on internet, he can provide a unique ID which the mailer can use (which will somehow be possible to integrate in scripts). This will helps him identify the sender, and remove the sender whenever he wants.
You can experience confirm kinda emails already, but this is far more advanced.
Further, mass emailing will be filtered away, if you not registering on central databases. It will be the choice of the ISPs if they gonna use the databases or not.
wow
