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Re:K-9 Mail is looking for funding by jorams on Sunday February 14, 2021 @11:05AM (#26133448)
The README has a single section about Pro features, and it starts with "All pro features are convenience or advanced features".

That definitely looks like the non-pro version is meant to be a free-to-use product.

Re:K-9 Mail is looking for funding by mgbmtl on Sunday February 14, 2021 @11:31AM (#26133678)
I use the free version and happy with it.