
Michael Burns
Desktop version is great and I have used it since inception. The Android app is just a warmed over k9 mail, and still has all of k9's deficiencies. Two glaring ones are no support for filtering messages (for example to automatically sort incoming mail) and the other, related one, is no autoresponder support. The desktop version has excellent filteration and the filters can be used to set up autoresponses based on details of the message. A curious failure.
26 people found this review helpful
Mozilla Thunderbird
July 7, 2026
Unfortunately the Android app doesn't support filters yet. This could be something we add in the future, though we don't know when. For now, please upvote and support requests for filters at connect.mozilla.org

Stephanie Oubre
Missed important emails I use Thunderbird on my desktop, but when I switched to using it on my phone as well, instead of the Gmail app, I miss several emails from a client because despite being configured to auto update and notify me, it didn't update until I opened the app several days later. I had also switched because I was hoping that the calendar that was on my desktop would be mirrored to the app, but the app has no idea of a calendar, so any invite I accept on my desktop is just lost.
9 people found this review helpful
Mozilla Thunderbird
September 9, 2026
While we are working on improving and refactoring our message sync, be sure to check your app has unrestricted battery access to enable background sync! You can check this by long pressing the app icon, tapping the info icon, and tapping 'Battery'

John Dennis
I love Thunderbird on my desktop & laptop, been a loyal user for a very long time. However the Android app is missing a feature that is so vital to my usage pattern I can't use the app. The missing feature is the action performed when a message is deleted, there is no option to move the deleted message to another folder (trash). The only options are to delete the message off the server or not. By moving a message to the trash folder I preserve the ability to retrieve a message that was deleted
21 people found this review helpful
Mozilla Thunderbird
June 2, 2026
Thanks for your feedback and one of our main priorities is to bring more desktop features to the Android app! We're sorry for any frustration, and we hope you follow our updates at roadmaps.thunderbird.net and make suggestions at connect.mozilla.org!