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I don’t trust Proton enough to use it exclusively. Personally I use their free email tier as a secondary mailbox.

  • They are not fully open source (I found only web client source code)
  • Their last independent audit was in 2021 and was done for beta version of their email
  • The audit itself was for security, nothing related to privacy
  • They advertise their email service as encrypted: encrypted:

End-to-end encryption Proton Mail is a private email service that uses open source, independently audited end-to-end encryption and zero-access encryption to secure your communications. This protects against data breaches and ensures no one (not even Proton) can access your inbox. Only you can read your messages.

Which I see as deceptive: end-to-end encryption is working without user involvement only for emails between Proton mailboxes. In other cases user needs to establish PGP encryption on their own. Inbox may be not accessible by Proton (we actually have no clue because server side code is closed source), but unencrypted incoming messages can be easily intercepted by Proton relays.

I’m not saying that Proton does all this nefarious stuff, but their marketing is questionable.

Monorepo hosting the proton web clients. Contribute to ProtonMail/WebClients development by creating an account on GitHub.
GitHubGitHub - ProtonMail/WebClients: Monorepo hosting the proton web clientsMonorepo hosting the proton web clients. Contribute to ProtonMail/WebClients development by creating an account on GitHub.
Nimbus

@pound_heap

When you send an encrypted email to a non-Proton user, you click on the lock icon to encrypt the email and assign it a password, which you need to get to your user. The recipient then receives an email with a link. They click on the link, enter the password and and can then view your email, which to my understanding is decrypted client-side.

proton.me/support/password-pro

@zerodawn

ProtonHow to send Password-protected Emails in Proton Mail | ProtonProton Mail lets you easily send secure, end-to-end encrypted emails to non-Proton Mail email addresses using a password.