Posteo
Posteo is an independent paid email service offering anonymous email accounts, address books and calendars. The company aims for a greater security, privacy and sustainability. It is ad-free and 100% powered by green energy from Green Planet Energy. It does not collect IP addresses and applies different methods of encryption at different points. It also provides a possibility to connect via two-factor authentication. Moreover, it is possible to sign up without having to enter any personal information.