Thunderbird is a free and open email application developed by the Mozilla Foundation to offer users an alternative to common mail applications. Therefore, the focus is on privacy and customizability of the program. Thunderbird is one of the most popular email programs in the world.
With the help of various add-ons, you can change its appearance and add features as you wish. For example, our SMS add-on makes it possible to send SMS from Thunderbird. Thunderbird is continuously developed and has an active community.