I can not delete smart mail boxes.
I can not delete smart mail boxes. Deleted by right clicking, then closed Mail. Reopened Mail and all of the deleted smart mailboxes reappeared. Tried changing Names and rules. Closed mail and reopened, old names and rules reappeared. Deleted com.apple.mail.plist from system library. No change. Using MacPro5.1 running MacOS 10.13.6, 32 GB ram. Does anyone have any suggestions?
Mac Pro