I see at least two problems at the source of junk e-mail. 1X no authentication of sender. One of the most problematic consequence is that reporting errors to se

I see at least two problems at the source of junk e-mail. 1X no authentication of sender. One of the most problematic consequence is that reporting errors to senders had to be disabled. smtp protocol, in its most common usage form, is broken. Relying on DNS to authenticate (DKIM) is just moving the problem to depend on DNS which is also weak from the security perspective. 2X the need for one to be contactable by anybody. This requires to open a door for incoming info which will be exploited by spammers. This is an old problem that managers are facing for years. The role of spam filter was hold by the secretary (human filtering phone calls, visits). The problem 1 is a technical problem and it is a shame it has not been solved yet. Problem 2 is the real root of spamming. There are various ways to address problem 2. This is one of the business model I'm currently investigating.