No dark mode for Apple Mail
Whilst most (mail) apps (Outlook for Mac, Postbox, Thunderbird etc.) on my system (iMac 27", Monterey updated as to August, 8, 2022) use dark mode, Apple Mail stubbornly refuses to do so. I did choose Dark Mode under Preferences but actually, under the Mail menu option "Viewing" there's no such option as "Use dark backgrounds for messages" (see screenshot). How come?