@Bm4n:
Email spam won't disappear until the system changes. If I can send an email right now impersonating your identity completely, first because you can send emails with another account's name and second because there are databases with the names and surnames of millions of users. First they need to update email security, then they need to ban the sale of personal data and then we can talk about the end of spam.
The rest of reading minds… we don't have completely feasible technologies available and that have existed for years. We'll have brain scanners in 4 years and even more so with software capable of interpreting it... if a simple voice detection is like a toy shotgun!, come on. I understand the musings of these people who dedicate themselves in R&D labs to imagining the future, but historically we know that they don't come true.
I didn't explain myself well. When I said "personal and intransferable parameters", I meant iris or fingerprint reading. If a truly effective system is made and blacklists of problematic users are made, SPAM could end up being a thing of the past. If there is SPAM now it's because it's very easy to open a mail account or change the IP. As soon as the user has to be identified biometrically, this problem will disappear.
As for impersonating the email identity, I suppose the impersonation won't be perfect. That is, that traces will be left of the IP from where the message is sent and such. I'm not very informed about the issue, but several times I've used some system to send notifications in my name and email from a web form, that email has ended up as junk mail despite including me as the sender and my email address. Here I speak without knowing much, just from experience.
This is certainly talking for talking, because predicting what will happen is impossible and predicting something as concrete and unpredictable as such a system becoming popular is useless. But anyway.
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