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Thanks so much! We're so glad you're liking Thunderbird on mobile - and that the QR code import was so helpful!
Edit: Whoops, this was supposed to be a reply to a post, but thanks for the replies about how much you like the feature!
@thunderbird
On K9, I'm liking (not) the decision to ...
Change the default view from accounts list. To show the inbox contents of the first account. Now to read an email needs 3 extra user actions (#usability), whist exposing contents of inbox to a casual observer. (#privacy)
Remove the ability to save draft emails for pop3 accounts, either automatically, or manually & throw away drafts. (#usability)
Remove the ability to sync all email accounts, now have to sync each in turn. (#usability)
https://f-droid.org/packages/eu.faircode.email/
Or a Proton or Tuta account and the according app.
And POP3? 
@PC_Fluesterer @thunderbird Already using FairEmail (for other reasons). Where one developer produces a far more polished product than the might of @thunderbird. However, there isn't a way to bulk import new settings to FairEmail.
"And POP3? :blobcatthink: "
Looks like my choices and or requirements don't meet your standards. My apologies for that.