Protonmail is also the world’s most versatile encrypted email service, supporting PGP encryption of Facebook notifications, and easy-to-use encryption for email clients such as Outlook, Thunderbird and Apple Mail.
Protonmail includes an encrypted contacts manager with digital signature verification, encrypted email for Android and iOS through their mobile app, and state-of-the-art protection against DDoS (distributed denial of service) attacks.
Launched to the public in 2014, Protonmail was founded by a team of CERN scientists, engineers and developers “with deep mathematical and technical knowledge” drawn together by “a shared vision of protecting civil liberties online”.
Based in Switzerland, their goal is “to build an internet that respects privacy and is secure against cyberattacks” and their aim is to build “the encrypted communication technologies of the future”.
In 2018, they passed an independent security audit in which “no major issues were discovered”.
Protonmail is more versatile but more expensive than Tutanota, providing 500 MB storage free with paid upgrades starting at €5 per month.