Tutanota's mission is to increase internet users' privacy while using email. To do so, this email client offers its service with all its security features for free. Although it does not have a free trial of the paid versions or a money-back guarantee safety net, with the free plan, it's possible to test the service since you’ll still be able to experience a large number of its features.
Use Tutanota with all of its security features for free, such as end-to-end encryption, encrypted calendar, and encrypted contact list.