Fast, efficient mail client for Mac, Windows, and Linux.

Mailspring on Mac
Category Productivity
Keywords email mail messaging imap gmail
License GPL-3.0
Downloads mailspring-1.1.4-0.1.x86_64.rpm mailspring-1.1.4-amd64.deb Mailspring-1.1.4-full.nupkg Mailspring.dmg MailspringSetup.exe RELEASES
Latest Release 1.1.4 (1.1.4)
Release Notes

1.1.4 (2/14/2018)


  • Searching in the Sent folder (and other folders assigned mailbox roles) now works reliably.

  • Connecting accounts no longer throws SIGABRT / 3221225477 errors in some scenarios. #292

  • Connecting accounts no longer fails when the email provider returns non-UTF8 characters in IMAP responses.

  • The open tracking pixel now has an alt tag that self-identifies it as a tracking pixel, which prevents messages from Mailspring from being flagged as spam by some providers. #668

  • Mailspring no longer registers for the Utility and Development application categories and appears in the mail package category on Debian systems. #673, #678

  • On Linux, the tray assets are larger again (48x48px) in an attempt to make them render properly in more distros.

  • In the Taiga theme, the selected item in dropdown menus is visible. #674

💌 Mailspring

Travis Status AppVeyor Status Mailspring Slack

Mailspring is a new version of Nylas Mail maintained by one of the original authors. It's faster, leaner, and shipping today! It replaces the JavaScript sync code in Nylas Mail with a new C++ sync engine based on Mailcore2. It uses roughly half the RAM and CPU of Nylas Mail and idles with almost zero "CPU Wakes", which translates to great battery life. It also has an entirely revamped composer and other great new features.

Mailspring's UI is open source (GPLv3) and written in JavaScript with Electron and React - it's built on a plugin architecture and was designed to be easy to extend. Check out to get started!

Mailspring's sync engine is spawned by the Electron application and runs locally on your computer. It will be open-sourced in the future but is currently closed source. When you set up your development environment, Mailspring uses the latest version of the sync process we've shipped for your platform so you don't need to pull sources or install it's compile-time dependencies.

Mailspring Screenshot


Mailspring comes packed with powerful features like Unified Inbox, Snooze, Send Later, Mail Rules, Templates and more. Mailspring Pro, which you can unlock with a monthly subscription, adds even more features for people who send a ton of email: link tracking, read receipts, mailbox analytics, contact and company profiles. All of these features run in the client - Mailspring does not send your email credentials to the cloud. For a full list of features, check out

Download Mailspring

You can download compiled versions of Mailspring for Windows, Mac OS X, and Linux (deb, rpm and snap) from


Mailspring's UI is entirely open-source and pull requests and contributions are welcome! There are three ways to contribute: building a plugin, building a theme, and submitting pull requests to the project itself. When you're getting started, you may want to join our public slack so you can ask questions and learn from other people doing development.

Building A Plugin

Plugins lie at the heart of Mailspring and give it its powerful features. Building your own plugins allows you to integrate the app with other tools, experiment with new workflows, and more. Follow the Getting Started guide to write your first plugin in five minutes. To create your own theme, go to our Theme Starter guide.

A plugin "store" like the Chrome Web Store is coming soon, and will make it easy for other users to discover plugins you create.

Building a Theme

The Mailspring user interface is styled using CSS, which means it's easy to modify and extend. Mailspring comes stock with a few beautiful themes, and there are many more which have been built by community developers. To start creating a theme, clone the theme starter!

Contributing to Mailspring Core

Pull requests are always welcome - check out CONTRIBUTING for more information about setting up the development environment, running tests locally, and submitting pull requests.

Something missing? Edit this app.