Can’t recive new mail’s

It seems that I haven’t received any new mails since 17th of June. Not even i the latest version 21.1. I only have 1 account. I found that if I press the mails online as read, it immediately shows up in the app. Furthermore I have 99+ unread in the app. I tried to “mark all as read” from the app. Suddenly all the latest mails appear (as read). Tried to resend a test message again (Still having 99+unread). The mail doesn’t appear until I press “set all as read”.

This request is also on google playstore.

I have the same problem, am on Fairphone 6, Android 16, K9 v 21.1. My account is set to fetch mail manually, but when I refresh, I just see the loading circle for a few minutes and then it stops. Can’t send email either. It’s a gmail account. It worked until Tuesday - I haven’t changed any settings - any idea what is going on?

I ended up just removing and readding the account, seems to work for now…

It seems that I had filtered my inbox on “read” then no unread appeared.

Simple but not smart that filtering is impossible to see. Furthermore that it doesn’t resets automatically.