>This should be applied to emails too. The regular person send what, 20 emails per day max ? Say it costs $0.01 per mail, anyone could pay that.

This seems flawed.

Poor people living in 3rd world countries that make like $2.00/day wouldn't be able to afford this.

>But if you want to spam 1,000,000 everyday that becomes prohibitive.

Companies and people with $ can easily pay this with no issues. If it costs $10,000 to send 1M emails that inbox but you profit $50k, its a non issue.