I use K9 now for a long time and recently it started to act strange.
I have the problem, that my sent mails didn’t get synced to the server. The Sent mails from the server are visible.
Also the deleted Mails doesn’t get sync (proberly) to the server. They stay undeleted and unread on the server sometimes. Each time I watch my thunderbird and K9 the same time. Deleting Mails in K9 are synced propberly. But sometimes the mails are only deleted in K9. If I try to resync the mails keep deleted in K9, but still undeleted on the server.
I don’t know what to try or to test. Anybody an idea, what I can try or test to fix this issue?