You can share and browse Mailspring Plugins, and discuss plugin development with other developers, on our (Right now, users need to "sideload" the plugins into the app by downloading them and copying them into place.) To create your own plugin, check out the Mailspring-Plugin-Starter.Ī plugin "store" like the Chrome Web Store is coming soon, and will make it easy for other users to discover plugins you create.
To create your own theme, check out the Mailspring-Theme-Starter. Follow the Getting Started guide to write your first plugin in five minutes. Building your own plugins allows you to integrate the app with other tools, experiment with new workflows, and more. Plugins lie at the heart of Mailspring and give it its powerful features. Our UI is entirely open-source and pull requests and contributions are welcome! There are a few ways to contribute: building a plugin, building a theme, improving translations, and submitting pull requests to the project itself. Unstable releases are available on Travis. There's also an AUR package maintained by (thanks!).
You can download compiled versions of Mailspring Libre build for Linux (deb and rpm), macOS (dmg and zip), and Windows (exe and msi) from GitHub Releases. By downloading Mailspring Libre build, you accept the MailSync license (which doesn't affect you as a regular user). Please note that Mailspring Libre build isn't fully open source right now: the sync engine, MailSync, is proprietary, and while we're working on replacing it, it probably won't happen anytime soon. This Libre build comes with no telemetry at all, and is still filled with powerful features you will love, like Unified Inbox, Snooze, Send Later, Mail Rules, Templates and more! Mailspring is a email client that is fast, free and beautiful.