You might want to find these to back up your mail or view attachments.
These instructions apply to all versions of macOS.
Theyre buried in a folder in the Library, and the archive uses a .mbox file extension.
Open a newFinderwindow or hit the desktop of your Mac.
Hold downOptionand selectGoin the top menu bar.
SelectLibraryfrom the dropdown menu.
Scroll down to find theMailfolder.
Find your folders and messages in subfolders of the V folder.
Open and explore these folders to discover and open or copy the files you’re looking for.