Tutanota

Tutanota is a German-based end-to-end encrypted email service that also offers a calendar and contact management features. Users can send and receive secure emails, schedule appointments, and store contacts within a privacy-focused environment. Key features include quantum-resistant encryption, a focus on data privacy, and a free tier. This service is suitable for individuals and businesses prioritizing secure communication and data protection, offering an alternative to mainstream email providers with a strong emphasis on privacy.