---
title: "Mailspring Open Source Email Client with Plugin Architecture"
description: "Mailspring is a beautiful, fast, and fully open source email client for Mac, Windows, and Linux. Built on Electron and React with a C++ sync engine, it supports unified inbox, snooze, send later, mail rules, and templates with a powerful plugin system."
verification: "security_reviewed"
source: "https://github.com/Foundry376/Mailspring"
category:
  - "Calendar, Email & Productivity"
framework:
  - "Custom Agents"
tool_ecosystem:
  github_repo: "Foundry376/Mailspring"
  github_stars: 17366
---

# Mailspring Open Source Email Client with Plugin Architecture

Mailspring is a beautiful, fast, and fully open source email client for Mac, Windows, and Linux. Built on Electron and React with a C++ sync engine, it supports unified inbox, snooze, send later, mail rules, and templates with a powerful plugin system.

## Installation

Choose whichever fits your setup:

1. Copy this skill folder into your local skills directory.
2. Clone the repo and symlink or copy the skill into your agent workspace.
3. Add the repo as a git submodule if you manage shared skills centrally.
4. Install it through your internal provisioning or packaging workflow.
5. Download the folder directly from GitHub and place it in your skills collection.

## Source

- [Agent Skill Exchange](https://agentskillexchange.com/skills/mailspring-open-source-email-client-plugin-architecture/)