I2P-Bote is a plugin for I2P that allows users to send and receive emails while preserving privacy. It does not need a mail server because emails are stored in a distributed hash table. They are automatically encrypted and digitally signed, which ensures no one but the intended recipient can read the email, and third parties cannot forge them. (i2pbote.xyz)
The Shadow Brokers published in his first post on Steemit an i2p-bote address to contact them:
o1uHOkOcMoFEa7O7dbEilzfMvWzo7bDu~td3x9gYz4b4t5OriJ7U6GUWr5GZoWxQ9f2TrIY5RzhpIMVP6hTLXZ