I only post this because there are computer geniuses here who may be able to confirm my suspicions that Yahoo's imap servers are in full on melt-down mode. I use Yahoo's imap servers to run their mail through Apple Mail and one minute everything looks normal and the next minute all Yahoo emails are gone way back to some time in early 2017 and the activity window says "Downloading messages 15,451 of 21,894". Then it churns away for an hour or so and then presto the emails reappear and no downloading. Then suddenly whoops! everything is gone again.

It is doing this on both my computers and my iPhone, all Apple stuff. The web interface for Yahoo mail seems stable however. So I figure it is the imap servers and not the service itself.

Yes no maybe? Russians?