Mail "On My Mac" & Smart Mailboxes have issues with MacOS 10.15.6 Upgrade.
After I set up Smart Mailboxes following an upgrade to MacOS 10.15.6 and quit Mail, the Smart Mailboxes disappear when Mail restarts. I also cannot re-import saved mbox files to mail "On My Mac" folders because Mail locks up. Anyone else having these issues?
iMac 27″ 5K, macOS 10.15