WARNING! You are responsible for your own encryption keys. If you lose them, they're gone forever and so is all of your encrypted data. No one can help you. With freedom comes responsibility.
A browser plugin to let you do fully encrypted email with most webmail providers, including GMail, Yahoo Mail, and many others, using PGP Encryption. This is not a decentralized service or product, but encryption is a critical component of decentralization and cryptocurrencies.
Mailvelope will not work without centralized DNS.
It will not work without central servers.
User accounts are self-hosted, meaning the user is in full control. An uncensorable and unstoppable monetization system is NOT supported.