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Foundry376/Mailspring

An open source desktop email client for Mac, Windows and Linux, built with Electron and React with a C++ sync engine.

Open-source alternative to:Microsoft OutlookSuperhumanSpark

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What is it?

Mailspring is a desktop mail client for Mac, Windows and Linux. It is a continuation of Nylas Mail, with the JavaScript sync code replaced by a C++ sync engine based on Mailcore2, which runs locally on the user's computer. The interface is written in TypeScript with Electron and React and is built on a plugin architecture designed for extension.

The client includes a Unified Inbox, Snooze, Send Later, Mail Rules and Templates. An optional Pro subscription adds link tracking, read receipts, mailbox analytics and contact and company profiles. Mail credentials stay in the client rather than being sent to a cloud service.

The project offers a plugin starter and a theme starter, both styled with CSS, so developers can customize the app or add integrations.

Key features

  • 01Unified Inbox with Snooze and Send Later
  • 02Mail Rules and reusable Templates
  • 03Plugin architecture for extending the app
  • 04CSS-based themes that can be customized
  • 05Local sync engine written in C++, so credentials stay on the device

Use cases

  • Daily email management on Mac, Windows or Linux desktops
  • Developers who want to build plugins or themes for a mail client
  • Users who prefer a local client over webmail for privacy

Topics

#email#electron#react#typescript#imap#desktop-app#cross-platform#electron-app#linux#mail

FAQ

What is Mailspring?
An open source desktop email client for Mac, Windows and Linux, built with Electron and React with a C++ sync engine. Mailspring is a desktop mail client for Mac, Windows and Linux. It is a continuation of Nylas Mail, with the JavaScript sync code replaced by a C++ sync engine based on Mailcore2, which runs locally on the user's computer. The interface is written in TypeScript with Electron and React and is built on a plugin architecture designed for extension.
Is Mailspring free to use? What license does it have?
Mailspring is open source under the GPL-3.0 license. Check the license terms before using it in commercial products.
Is Mailspring still maintained?
Actively maintained. The last commit to Mailspring was on Oct 16, 2026.
What can I use Mailspring for?
Daily email management on Mac, Windows or Linux desktops Developers who want to build plugins or themes for a mail client Users who prefer a local client over webmail for privacy
Where can I get Mailspring?
The source code and installation instructions are on GitHub: https://github.com/Foundry376/Mailspring

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