Wikipedia
Tutanota is an open-source end-to-end encrypted email software and freemium hosted secure email service based on this software, developed and provided by a German company, Tutao GmbH, in 2011. The name Tutanota is derived from Latin and contains the words "tuta" and "nota" which mean "secure message"
Tutanota offers end-to-end encryption for emails sent from one Tutanota user to another. To external recipients, who do not use Tutanota, a notification is sent with a link to a temporary Tutanota account. After entering a previously exchanged password, the recipient can read the message and reply end-to-end encrypted.
The hosted service does not offer IMAP/ POP3/ SMTP access, but has free apps for iOS and Android. Users of Premium accounts can use their own domains with Tutanota.
Tutanota currently supports the following browsers:
- Firefox (desktop)
- Opera (desktop, Android)
- Chrome (desktop, Android)
- Safari from version 6.1 (desktop, iOS)
- Internet Explorer from version 10 (Desktop)
- Blackberry 10