With macOS Sonoma, Apple has officially pulled support for legacy plug-ins for its Mail app on the Mac, with MailKit extensions now the only way forward.
macOS Sonoma officially kills support for legacy plug-ins in the Mail app

With macOS Sonoma, Apple has officially pulled support for legacy plug-ins for its Mail app on the Mac, with MailKit extensions now the only way forward.
Apple unveiled macOS Sonoma at WWDC 2023, promising a major update for the Mac that lots of users are likely to adopt on release day. But if you depend on the sideloading capabilities of AltServer and AltStore, then you may want to consider steering clear, at least for now.
macOS Sonoma improves Mac gaming with new features like Game Mode, which reduces Bluetooth latency, and premium new titles arriving in 2023.
You can disable iCloud Drive on iOS 17 without losing iCloud syncing features in third-party apps that use Apple’s CloudKit framework.
Check the official macOS Sonoma system requirements to see if your Mac is supported because Apple has trimmed the device compatibility list for macOS 14.
iOS 17's new App Store download timer automatically appears when downloading something from the store that'll take more than a few seconds.
iOS 17 lets you just say “Siri” instead of the usual “Hey Siri” trigger phrase. As a bonus, Apple’s digital assistant now recognizes multiple back-to-back commands.