
Proton Mail
Proton Mail is a secure email service centered on privacy, with encryption designed to protect communications.
Tuta is an encrypted email (and calendar) service focused on privacy, using end-to-end encryption across mailbox data.
Tuta describes its service as automatically end-to-end encrypting user data, and its documentation explains that mailbox data such as emails, calendar, and address book are stored end-to-end encrypted, with limited exceptions (for example, addressing metadata). Product capabilities and terminology may evolve as the service updates.







