Thunderbird Beta. The config offers an outdated version.

[AlfoMora]

The official configuration file available on the website offers an outdated version of Thunderbird Beta.

https://apps.obtainium.imranr.dev/
Config:

{"id":"net.thunderbird.android.beta","url":"https://github.com/thunderbird/thunderbird-android","author":"Thunderbird","name":"Thunderbird Beta","additionalSettings":"{"includePrereleases":true,"filterReleaseTitlesByRegEx":"Thunderbird","dontSortReleasesList":true,"about":"Thunderbird Beta for Android – Open Source Email App for Android (fka K-9 Mail).","appName":"Thunderbird Beta","appAuthor":"Thunderbird"}"}