Has the recent macOS 10.14.6 (18G9009) update removed Mail Manage Plug-In
It appears that the latest 10.14.6 update has removed the "Manage Plug-in" setting in Mail.
I tried all the terminal commands to re-enable it, such as "sudo defaults write “/Library/Preferences/com.apple.mail” EnableBundles 1", "defaults write com.apple.mail EnableBundles -bool true", "defaults write com.apple.mail EnableBundles -bool YES", and "defaults write com.apple.mail BundleCompatibilityVersion 4", but nothing has worked.
I'm using SpamSieve to filter the barrage of junk mail and it now longer works since the update.