All emails disappear to not be seen again after they flash up in the INBOX. I have shut off the so far useless unified inbox because nothing would show there.
I am new to K-9 but a new cell phone has required a new program. I have configured, used and saved every email since 1995. So I am not a newbie.
I require POP3 and the app uses POP3. In frustration I have also connected to IMAP no success. The emails just do not show up. I have read emails this morning but then need to return to them for more work and they are gone. Cannot find a trace of them in deleted / trash, archive, or inbox folders.