This is the email service created by CERN in Switzerland offering greater security because it encrypts all your emails to protect you from hackers and spying governments, and corporations.
Functions:
It is responsible for protecting all your user data according to privacy laws of Switzerland which is where its servers are housed. It's free but you can donate support to the cause.
Activities:
It ensures that no third party can read your e-mails. The encryption is automatic, it works end to end, and offers 500MB of capacity.
How to use:
Just create an account and create your contact list. Start sending e-mails to enjoy its advantages such as password protected or self-destructing messages.