A privacy friendly email service is long due. I'm a total noob in blockchain technology; my idea might look outright infeasible or there might already be such platforms.
Blockchain enables distributed storage solutions like SIA, storj; digital marketplace like LBRY and the list is becoming longer. Is it possible to create a distributed email service? https://protonmail.com, https://tutanota.com and https://mailbox.org, among a few others, claim to respect users' privacy. Still, distributed ecosystem is always more appealing.