Mailspring is an open-source desktop email client for Windows, macOS, and Linux. It supports multiple email accounts, a unified inbox, snoozing, scheduled sending, mail rules, templates, calendar features, and a plugin system. Its synchronization engine is written in C++ and runs locally on the user's computer.
Features
Mailspring supports multiple email accounts through a unified inbox, making it possible to manage messages from different accounts in one interface. It also includes search, snooze, send later, mail rules, templates, and other standard email-management features.
The calendar provides event management directly inside the application. Recent releases added improved calendar interactions, including converting events between all-day and timed events by dragging them.
Mailspring supports email templates with subject lines, and threads can be dragged into the composer to attach them as EML files. Folder contents can also be exported to MBOX files.
The application includes an open plugin architecture. Developers can create plugins and themes, allowing Mailspring to be extended beyond its built-in functionality.
Mailspring also includes an optional MCP server that allows local AI agents to interact with mail. The newer releases include an attachment retrieval tool, while the Claude Desktop integration uses a built-in stdio bridge.
For users who want additional email features, Mailspring Pro adds features such as link tracking, read receipts, mailbox analytics, and contact and company profiles.
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Mailspring 1.25.0 Release Notes:1.25.0 (9/19/2026)Features:
Security: This version includes several patches for security vulnerabilities and is recommended for all users. Thanks 홍서연 at ENKI WhiteHat for detailed investigation and reporting. Bug Fixes:
Improvements:
Developer:
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Performance and Compatibility
Mailspring uses a C++ synchronization engine based on Mailcore2 rather than the JavaScript synchronization system used by its Nylas Mail predecessor. The project states that this design uses roughly half the RAM and CPU of Nylas Mail and is designed to minimize CPU wakeups.
The desktop interface is built with Electron, React, and TypeScript, while the synchronization engine runs locally on the computer. This gives Mailspring a modern cross-platform interface while keeping the core mail synchronization engine native.
Mailspring continues to receive updates. Version 1.24.1 was released on September 14, 2026, adding folder-level Mark All as Read functionality, unread-count options, improved unified-inbox draft behavior, and a new plugin extension point.
The latest release also improved Windows compatibility by adding recovery from GPU-related renderer crashes during startup. On macOS, Mailspring now requires macOS 13 Ventura or later because newer Chromium versions dropped support for macOS 12. Windows and Linux requirements remain unchanged.
System Requirements
Mailspring is available for Windows, macOS, and Linux. The latest release requires macOS 13 Ventura or newer. Windows and Linux system requirements are unchanged in the latest release.
Supported platforms:
Windows
macOS 13 Ventura or newer
Linux
Internet connection for synchronizing email accounts
Additional storage for local mail data and application files
The project does not specify a fixed minimum CPU or RAM requirement in its main documentation.
Pros and Cons
Pros
Open source
Available for Windows, macOS, and Linux
Unified inbox
Multiple email accounts
Snooze
Scheduled sending
Mail rules
Email templates
Calendar
EML and MBOX export options
Plugin and theme support
C++ synchronization engine
Local mail synchronization
MCP support for AI integrations
Active development and regular releases
Optional Pro features
Cons
Uses Electron for the desktop interface
Some advanced features require Mailspring Pro
macOS 13 or newer is required by the current release
Local mail data requires additional disk space
AI and MCP functionality requires additional configuration
Plugin compatibility can vary between extensions
How to Install
Download the appropriate Mailspring package for Windows, macOS, or Linux from the official Mailspring download page. The project provides compiled packages for all three platforms.
Install the application using the normal installation process for your operating system. After launching Mailspring, add your email accounts and complete the provider authentication process.
Once an account is configured, Mailspring synchronizes its messages locally and provides access through the unified inbox and account-specific folders.
Users who need additional functionality can configure plugins, themes, templates, calendar features, or the optional MCP integrations.
Final Verdict
Mailspring is a capable open-source desktop email client that combines a modern interface with a native C++ synchronization engine. Its unified inbox, mail rules, scheduled sending, templates, calendar, export tools, and plugin architecture make it suitable for users managing multiple email accounts.
The application remains actively developed, with recent releases adding features such as Office 365 shared mailbox support, MBOX export, calendar improvements, MCP integrations, and Windows crash recovery.
The main limitation is that some advanced features are reserved for Mailspring Pro, while the Electron-based interface can use more resources than a fully native desktop client. For users looking for an open-source, cross-platform email application with a broad feature set, Mailspring is a practical choice.
Developer:
Foundry 376, LLC
Operating System:
Windows / macOS / Linux
Date Added:
2026-09-20T10:26:09.000Z
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