why is mail such a mess -duplicate messages in inbox
multiple junk folders, 1 spam folder, several 'recovered messages' folders all empty.
iMac 21.5″, macOS 10.15
The spam folder is a server folder. Normally it is mapped to the Junk mailbox. You can set up Mail to store junk locally. That will create a local Junk folder and you will see the server’s Spam folder listed under the account heade in the mailbox list.