Question: Cannot Permanently Delete Mail Smart Mailbox(es) [MBPro2019+Catalina]
I delete the Smart Mailbox (one, or several, it doesn't matter), but when I close/re-open Mail app, it's (they're) there again. I tried the "rebuild" suggestion found in forums, nothing happened. I recently changed the name of my Home Directory, which resulted in Dropbox issues, so changed the name back (Dropbox fixed).
Maybe I've disrupted how and/or where Mail saves?