Search in Mail stopped working in Big Sur
I don't know if this problem started when I updated to Big Sur, but I do know it wasn't happening before the update. When I enter a name in the search field for Mail, I get zero found, regardless of which mailbox I may have selected. I have tried rebuilding the mailbox and the suggestions found here:https://support.apple.com/guide/mail/if-searching-doesnt-find-the-right-emails-mlhlp1192/mac
Nothing works except logging out of my user and then back in. When I do that, the search works fine for awhile, but then stops. I haven't figured out yet if this is caused by putting the computer to sleep or something else. I do use SpamSieve so don't know if that is related somehow. Everything is up to date. It is getting annoying to have to keep logging out and back in to use my search function!
MacBook Pro 15″, macOS 11.1