Proton Mail
Proton Mail is an end-to-end encrypted email service from Switzerland. Messages are encrypted so that not even Proton can read them, making it a strong alternative to Gmail and Outlook.
Proton Mail is developed by Proton AG, based in Geneva, Switzerland. Emails between Proton users are end-to-end encrypted by default and all messages are stored with zero-access encryption, meaning Proton itself cannot read your mail.
The service offers a free tier and paid plans that add storage, custom domains and access to the wider Proton suite, including calendar, cloud storage and a VPN. The client applications are open source.
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