You should assume that US and Israeli intelligence services can read everything in your Protonmail.

Other encrypted webmail providers should also be regarded with suspicion for similar reasons

  • chad1234OP
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    5 years ago

    Protonmail and tutanota offer an open source client, allowing you to verify their promises of encryption. Start does not, so it is quite possible that your message appears in plain text on their side. Start uses TLS for user to server which is similar level of security as normal gmail, hotmail etc.