Thanks, can't say we were the first to come up with this specific idea though. Gotta credit Adam Back's hashcash paper for spam mitigation (http://www.hashcash.org/hashcash.pdf) and Earn.com (https://earn.com/blockchain-personalities/) for the part about public figures.
Our goal is to gather the best ideas in the space and infuse them into one solid platform.
If it was interesting to you so far, make sure to read the whole thing, decentralized end-to-end encrypted email is just one of the features.
All in due time, we're just getting started. Many more things are to be announced in the coming weeks, stay tuned!