GPG Mail is not compatible
with macOS 14 Sonoma yet!
⚠️ Please refrain from upgrading to macOS Sonoma for now if you need GPG Mail for your daily work! ⚠️
Apple has dropped support for macOS Mail plugins, such as GPG Mail, in macOS Sonoma. If you rely on our OpenPGP integration for your daily work, please refrain from upgrading to macOS Sonoma at this time. As a replacement Apple introduced "Mail Extensions". For GPG Mail however, some very important functionality is still missing from the Mail Extensions API which will not be available before the first update of macOS Sonoma.