I did a search on TB's Github "folders" and this is what i got. https://github.com/thunderbird/thunderbird-android/issues?q=is%3Aissue+state%3Aopen+folders It seems TB does have folders.
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I only haxe one phone with Thunderbird. Checked but I see no way to add folders. Since TB is based on K-9 Mail I assume the latter can't do it either but will check. FairEmail, however, does allow for creation of folders.
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