next generations of email not spam friendly
 

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 :pimp

Hum.. But opt-in will still be possible

Yep - if you are registered and authorized.

This will never fly. Nobody wants to do that extra step. Those form validation codes all over the place are a pain as it is.

I dunno, spam watch seems to work okay. You only have to confirm once.

Yes. Thats why people will have the choice to use it or not. Maybe we also will see different levels of "security", like in firewalls.

if theres money to be made, it will be hacked.

Agreed. Too many legit businesses doing a lot of business via email.

This would reduce work productivity, I dont see major companies supporting this, unlike can-spam.