Thunderbird

Open Source MPL-2.0

The versatile open-source email client by Mozilla

Website

www.thunderbird.net

GitHub

thunderbird/thunderbird-desktop

Difficulty

● Easy

Last check

2026-02-20

Description

Thunderbird is a free email client developed by the Mozilla Foundation. It offers comprehensive email management with support for IMAP, POP3, and SMTP, an integrated calendar, address book, and chat functionality. Thunderbird supports end-to-end encryption with OpenPGP, provides extensive filtering features, and can be extended through numerous add-ons. With the new Supernova interface, the design has been fundamentally modernized.