The email service in the Private Cyberspace Data Node comes with its own Pretty Good Privacy (PGP) based encryption software, allowing easy encryption of data like emails WITHOUT needing the exchange of a encryption keys between the sender and receiver.
PGP has a colourful history and was even considered by the US government as a munition once. Today it remains a highly effective security tool.
Snappymail (the web browser email software that come in all Private Cyberspaces Data Nodes) supports three ways of using OpenPGP.
GnuPG
Mailvelope
OpenPGP.js
None of them is perfect, but some end-to-end encryption is better than none for certain private emails. Mailvelope is enabled by default on most Private Cyberspaces, ask your Information Entities to see whether they support the other 2 OpenPGP methods.