Mailboxes disappeared
My private mailboxes have been removed/disappeared from the side mailbox list after a System Preferences update.
I have tried to find them but do not know where to look as mail is not listed under library but assume that they are still somewhere on the Mac HD.
I have an iMac (Retina 4K,21.5-inch,2017) Mojave
iMac 21.5" 4K, macOS 10.14