Thunderbird is a free, open-source, and powerful email client software, including email, calendar, and contacts three major features! It is an excellent alternative to Outlook and Foxmail!
It comes from Mozilla, the parent company of Firefox, and is a classic free open-source software with over 20 years of history, still being updated.

Thunderbird supports Windows, macOS, and Linux. Currently, the mobile version only supportsAndroid. Thunderbird is user-donated, 100% open source, highly respects user privacy, and has no ads!

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