# 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.

- Skill: `agentskillexchange/mailspring-open-source-email-client-with-plugin-architecture` (Agent Skill)
- Install (CLI): `npx skillmds@latest add agentskillexchange/mailspring-open-source-email-client-with-plugin-architecture`
- Raw SKILL.md: https://api.skillmd.com/api/skills/agentskillexchange/mailspring-open-source-email-client-with-plugin-architecture/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Web & Frontend
- Author: agentskillexchange (https://skillmd.com/u/agentskillexchange)
- Updated: 2026-09-08
- Page: https://skillmd.com/skills/agentskillexchange/mailspring-open-source-email-client-with-plugin-architecture

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# 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

Use the upstream install or setup path that matches your environment:
- npm install
- npm start
- npm start -- --help
- npm run-script build

Basic usage or getting-started notes:
- profiles. **All of these features run in the client - Mailspring does not send
- To install all dependencies and run Mailspring from its source code,
- run the following commands from the root directory of the Mailspring repository:

- Source: https://github.com/Foundry376/Mailspring
- Extracted from upstream docs: https://raw.githubusercontent.com/Foundry376/Mailspring/HEAD/README.md

## Source

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