All sent mail disappeared from Sent Mail folder in Sequoia
Got a new MBA M3 and I love it. But suddenly, like today, my Sent Mail folder is empty. Oh, except for one lonely email from back in 2016! I sent myself test emails -- they show up in my Inbox but not in Sent Mail. They are in the webmail sent folder. If I search for a subject line, the emails show up, but not in the sent folder. I've seen similar problems going back years but haven't found any causes let alone solutions. My accounts (IMAP) are all enabled with the correct server settings -- I've changed nothing. I tried synching from the drop-down menu -- if that did anything I couldn't tell, but I think everything is synched already because IMAP. Everything imported perfectly from my old Big Sur MBA. Oddly, and this may be a clue, the Sent Mail folder on that computer is empty too! I'm thinking server? But everything is there. I called the ISP (Comcast) but got no help -- they were going to call me back after a half hour, that was 2 hours ago.
I called Apple but got no real help, although she said it might have something to do with updating Sequoia to 15.1, but I did that like a week or more ago and there were no problems. Just today -- everything is gone. I haven't tried rebuilding, but that didn't seem to work for other people in the Community. Restarting -- nada.
Any suggestions greatly appreciated.
MacBook Air 13″, macOS 15.1