Just a note that it’s now also available on F-Droid

https://f-droid.org/packages/net.thunderbird.android/

The beauty/advantage of Linux Eco-system is one can pick and choose based on his/her preferences.

GB or MB?

Info at FlatHub -

Here is a screen-shot of latest Thunderbird (ESR) Email client: https://www.thunderbird.net/media/img/thunderbird/new/screens/mail-screen.png

Note that -

Operated by MZLA Technologies Corporation, a subsidiary of the Mozilla Foundation, Thunderbird is an independent, community-driven project that is managed and overseen by the Thunderbird Council, which is elected by the Thunderbird community.

source: https://en.wikipedia.org/wiki/Mozilla_Thunderbird

Thunderbird 128 ESR has a really nice/modern look. Besides, if you don’t like the default look, you have plenty of themes to use with.

It’s really helpful and quite fun.

Thanks OP for sharing.

I’m currently sticking to production branch (550) which seems to be more performant for daily usage.

Very confusing title!!

Seems to have some severe bugs: https://github.com/wasi-master/13ft/issues