Mail.app in macOS 10.11 and earlier used to check the plugins compatibility using the SupportedPluginCompatibilityUUIDs key in the plugin’s Info.plist. For example a Mail plugin would only be compatible with macOS 10.11.6 if its Info.plist contained the following:
<key>SupportedPluginCompatibilityUUIDs</key> <array> <string>71562B89-0D90-4588-8E94-A75B701D6443</string> </array>
Mail.app version 10.0 in macOS Sierra (10.12) now uses a different key to check the plugins compatibility. It now requires a key with the format Supported%ld.%ldPluginCompatibilityUUIDs where “%ld.%ld” is the operating system version like “10.12”.
If you want to make your Mail.app plugin compatible with macOS Sierra, you will need to add a key in your Info.plist like:
<key>Supported10.12PluginCompatibilityUUIDs</key> <array> <string>36CCB8BB-2207-455E-89BC-B9D6E47ABB5B</string> </array>
Note that the UUID “36CCB8BB-2207-455E-89BC-B9D6E47ABB5B” is for macOS Sierra 10.12 beta 3.
Also by default the Mail plugins support is disabled. In order to enable it you first need to run in the Terminal the following:
defaults write com.apple.mail EnableBundles -bool true
Related post: Disable swipe to delete in Mail.app on OS X 10.11