I sometimes experience this too using IMAP. Just leave your inbox and go to your account overview or to another folder.
When you go back to your inbox all read email will show up again. I mentioned this before. It is definitely a bug! Am 14.03.2020 um 14:35 schrieb Nancy R.:
I believe its POP3, but I don't know how to check that. At any rate, I don't believe this is caused outside K-9. It only happens when the inbox gets full, maybe 30 emails. But it's certainly under 50. I don't know the exact number, because it happens suddenly and randomly. And infrequently. I can go months without a problem. And when they vanish, the inbox becomes empty. It shows no messages. So it's not a matter of showing only the first ones. There is nothing there anymore.
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