Encrypted email as a service is probably snake oil. The ways of failure are so many that you have to be an expert to avoid leaking. However, if you and your re

Encrypted email as a service is probably snake oil. The ways of failure are so many that you have to be an expert to avoid leaking. However, if you and your receivers have that expertise, you could communicate by using PGP encryption that is encoded to base64 and use any email service.