Proton
Empowering you to choose a better internet where privacy is the default. Protect yourself online with Proton Mail, Proton VPN, Proton Calendar, Proton Drive. Proton Pass and SimpleLogin.
Proton Mail is the world's largest secure email provider. Swiss, end-to-end encrypted, private, and free.
Proton VPN is the world’s only open-source, publicly audited, unlimited and free VPN. Swiss-based, no-ads, and no-logs.
Proton Calendar is the world's first end-to-end encrypted calendar that allows you to keep your life private.
Proton Drive is a free end-to-end encrypted cloud storage that allows you to securely backup and share your files. It's open source, publicly audited, and Swiss-based.
Proton Pass Proton Pass is a free and open-source password manager which brings a higher level of security with rigorous end-to-end encryption of all data (including usernames, URLs, notes, and more) and email alias support.
SimpleLogin lets you send and receive emails anonymously via easily-generated unique email aliases.
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At least on Windows it works with Thunderbird.
Only because of the bridge, which is handling the encryption part. That works on Mac as well as on Linux also.
However an integration to 3rd party clients without such an encryption layer (Bridge) doesn't work.
For those unaware, proton mail bridge is a program that sets up a local proton proxy that decrypts the emails then serves them up via a local imap server. Thus the "bridge." So Thunderbird isn't pulling from proton, the bridge is pulling the encrypted mailbox and decrypting, Thunderbird pulls from local unencrypted bridge.
https://proton.me/mail/bridge