If you want to provide a completely anonymous system why do not you use cryptonight protocol?
there was a project wanted to create the same thing as yours(but they decided to stop it because they were busy with their real life and other stuff),
cryptonight is a privacy-oriented protocol.
https://bitcointalksearch.org/topic/ann-xvv-veronite-a-multi-platform-brand-pow-airdrop-cn-heavy-4872144 is the project that I mentioned above.
there was a project wanted to create the same thing as yours(but they decided to stop it because they were busy with their real life and other stuff),
cryptonight is a privacy-oriented protocol.
https://bitcointalksearch.org/topic/ann-xvv-veronite-a-multi-platform-brand-pow-airdrop-cn-heavy-4872144 is the project that I mentioned above.
Maybe cryptonight is a good choice. But at these time , Ethereum have a lot of users and system is safe and stable operation.
Peoples are get used to use the chrome plugin wallet, like metamask , dapper , Mew ..etc
Mail system is just the first applicatioon, we want to create a Ethereum identity for people in the internet or any other web server at finally!
Thanks for your advice! We are very glad to hear the suggestions and we want to attract anybody to join the open source community.