Bote 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.
Bote uses the I2P network to provide anonymity. An I2P router is bundled in the app, but if the I2P app is installed then it will be used by default. Get I2P: http://goo.gl/1YTfpV