💌 A beautiful, fast and maintained fork of @nylas Mail by one of the original authors.
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.snapcraft Adding Linux Snapcraft configuration, integration with Travis Oct 5, 2017
.vscode Bring back the Thread Sharing plugin 🎉 Mar 30, 2018
app umich.edu is now using Gmail #1068 Sep 17, 2018
mailsync @ d82837c Prefer PLAIN / LOGIN over CRAM-MD5 which requires a previously exchan… Aug 15, 2018
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scripts Bump to a newer version of runas with 1.8.x support Jan 29, 2018
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.appveyor.yml Build native modules with VS 2015 because V8 now requires it Jan 29, 2018
.babelrc [*] use hardlinked .babelrc for AppVeyor Mar 7, 2017
.eslintrc Disable the “no-cond-assign” eslint rule Jan 26, 2018
.gitignore Make password management errors immediately fatal Nov 30, 2017
.gitmodules Fix rename of mailsync module Sep 5, 2017
.prettierrc Adopt prettier , upgrade ESLint Sep 26, 2017
.travis.yml Install execstack on Travis Nov 1, 2017
CHANGELOG.md Bump to 1.4.2 and update changelog Aug 15, 2018
CONTRIBUTING.md Update CONTRIBUTING to reference other linux dependencies Jul 16, 2018
ISSUE_TEMPLATE.md Add a note to the ISSUE_TEMPLATE asking for mailsync logs Aug 2, 2018
LICENSE-mailsync.md Add small note with mailsync licensing information Oct 23, 2017
LICENSE.md fix(license): Swap ref to GPLv3 with the whole thing so GitHub picks … Oct 15, 2016
README.md Add info for updating an existing Nylas theme (#700) Feb 26, 2018
ROADMAP.md Bump to 1.2.3, update Changelog for 1.2.2 and roadmap May 30, 2018
book.json Switch product name to “Mailspring” Sep 5, 2017
package-lock.json Bump to Electron 2.0.2 🎉 Jun 25, 2018
package.json Bump to Electron 2.0.2 🎉 Jun 25, 2018
yarn.lock Bump to Electron 1.8.2-beta5 Feb 5, 2018


💌 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 CONTRIBUTING.md 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 getmailspring.com.

Download Mailspring

You can download compiled versions of Mailspring for Windows, Mac OS X, and Linux (deb, rpm and snap) from https://getmailspring.com/download.


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!

If you are updating an existing Nylas theme for Mailspring here is a step by step tutorial. Notice: as part of the update process you will probably need to import mailspring base variables.

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.