Apple Mail can't find new messages, smart mailboxes don't work, Spotlight rebuilds changes nada
In macOS 10.12.6 with Mail 10.3 suddenly I can't find messages, nor do Smart Mailboxes work. I've rebuilt Spotlight multiple times, rebooted the system, but nothing seems to make it work inside Mail.
When I search in Spotlight in the menu bar or in Finder though also recent messages show up, though I'm not sure search results are complete. Actually, I get results even as I just added my drive to the ignore list in Spotlight preferences. I haven't seen that before.
Any ideas?
MacBook Pro 15", macOS 10.12