Been using k9 for… well I don’t know… but it’s several years. Nice and intuitive to use, but many advanced options tucked away, too.
My smartphone guide ages well with such solid app recommendations. You go K-9!
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If you drop down the versions you’ll find the newest.
Fwiw, I am not a long time user but do prefer the new 5.800.
Same for me, here. I’d suggest updating repositories, but I just did that and it didn’t help.
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.