ProtonMail is a free and secure email service that offers end-to-end encryption for emails, meaning only the sender and recipient can read the contents of the message. It was founded in 2014 by a group of scientists and engineers who wanted to create an email service that would protect user privacy and security.

ProtonMail offers a free basic plan with limited storage, and paid plans with more storage and features. It has a user-friendly interface and offers several security features such as two-factor authentication, self-destructing messages, and the ability to send password-protected emails.
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