Mail search totally broken since upgrading to Big Sur

Thanks, but none of those did anything. Like I said, the frustrating things is that when I start to type something in the search bar, the things I know are there show up as options, so it "knows" they're there, but then it doesn't find them.

Googling around, this is an extremely common complaint that Apple seems unwilling to address. One fix I found was to remove the search bar and then put it back. After waiting for it to re-index, that works for a few days, then stops again.

Now I'm stuck going directly to each server if I want to search for anything. Very frustrating.

OK, I upgraded to Monterey AND deleted the envelope files AND removed and re-added the search bar AND did a safe boot, then waited until the next morning for everything to re-index.

One or more of those things seems to have worked - for now at least.

Maybe this is a clue: If I type the info into Searchlight, it finds the message, but there's no preview and if I click on it nothing happens.