Proton Mail

This privacy-focused encrypted email service provides end-to-end encryption for email communications, ensuring message contents, attachments, and metadata remain inaccessible to the service provider, government surveillance, and third-party advertisers through client-side encryption. The encryption uses OpenPGP standards with automatic key management for seamless encryption between users, and password-protected encryption for messages sent to external email providers. Additional features include self-destructing messages that delete after specified time periods, alias email addresses for protecting the primary address, and custom domains. The security infrastructure includes two-factor authentication, account recovery, and a strict no-logs policy verified by independent audits. The product ecosystem extends to a zero-knowledge encrypted calendar, a cross-platform password manager, a virtual private network routing traffic through encrypted tunnels, and cloud storage with client-side encryption. The open-source client applications enable community security audits. Designed for privacy-conscious individuals, journalists, activists, lawyers, and businesses handling sensitive communications.