A beautiful, fast, and fully open-source desktop mail client for Mac, Windows, and Linux.
Mailspring is an open-source desktop email client for Mac, Windows, and Linux. It provides a fast, feature-rich alternative to commercial email clients with a focus on performance, privacy, and extensibility. The client processes all email data locally, ensuring user credentials and information never leave the device.
Users seeking a modern, customizable, and privacy-conscious desktop email client across major operating systems. It is ideal for developers and power users who value extensibility through plugins and themes.
Developers choose Mailspring for its significantly improved performance over its predecessor, its commitment to local data processing for enhanced privacy, and its open-source, plugin-based architecture that allows for deep customization and community-driven extensions.
:love_letter: A beautiful, fast and fully open source mail client for Mac, Windows and Linux.
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Mailspring's C++ sync engine uses roughly half the RAM and CPU of its predecessor, Nylas Mail, and minimizes CPU wakes for improved battery life on laptops.
All email credentials and data are processed locally on your device, with nothing sent to the cloud, ensuring enhanced security and privacy.
Built on an open-source plugin system with starter kits for themes and plugins, allowing developers to easily customize and extend functionality.
Includes unified inbox, snooze, send later, templates, and mail rules, streamlining email management without relying on cloud services.
Advanced features like link tracking and read receipts are only available with a Mailspring Pro subscription, which may alienate users expecting a fully open-source experience.
Despite optimizations, as an Electron app, it can still consume significant system resources compared to native email clients, especially on older hardware.
The plugin store is 'coming soon', and current plugins require manual sideloading, making discovery and installation cumbersome for non-technical users.
Mailspring is an open-source alternative to the following products:
Apple Mail is the default email client application on macOS, iOS, and iPadOS for managing email accounts, sending messages, and organizing mail with built-in integration.
Thunderbird is a free and open-source email client developed by Mozilla that also supports news feeds, chat, and calendar functionality.