[ivanpashenko]

Everyone who write to your public email have to pay. So basically new contacts. For friends and people you know you use your private email.

This is how a solution could look like: http://wrte.io

[Jipha]

I could see it being used. Lots of people get hundreds of emails a day being pitched to or asking for help. Charging people (even a small amount) might get people to put more effort into their emails.