- Mailspring now stores user preferences in the appropriate platform-specific location: `Library/Application Support` on the Mac, `AppData/Roaming` on Windows, etc.
-`NylasEnv` is now known as `AppEnv` and `nylas-exports` and `nylas-component-kit` have been renamed `mailspring-*`. Additionally, packages need to specify `"engines": {"mailspring":"*"}` instead of listing `nylas`.
- Much more of Mailspring has been converted to ES206, and CoffeeScript is no longer supported for plugin development. The CoffeeScript interpreter will be removed in a future version. Please use ES2016 JavaScript instead.
- Mailspring now uses `Prettier` — before submitting pull requests, ensure `npm run lint` is clean, or add a Prettier plugin to your text editor. (It's awesome!)
- Mailspring does not send your email credentials to the cloud. Features like Snooze, Send Later, and Send Reminders now run on your computer. Future versions may re-introduce the option to run these features in the cloud.