All emails from ProtonMail to ProtonMail are end-to-end encrypted. For ProtonMail users who want to send end-to-end encrypted emails to non-ProtonMail users, we

All emails from ProtonMail to ProtonMail are end-to-end encrypted. For ProtonMail users who want to send end-to-end encrypted emails to non-ProtonMail users, we offer an Encrypt for Outside option. We also use zero-access encryption for data at rest that renders digital files inaccessible to the service provider. ProtonMail relies on a subscription model, which means that users upgrade to get additional storage, more custom domains, priority support, etc. Because our users pay us to protect their privacy, our financial interests are perfectly aligned with theirs, and unlike adtech companies, we have no incentive to collect data on our users.