About
MCP Server for JMAP (Fastmail) over stdio
README
Read emails via MCP!
Introduction
JMAP-MCP is a connector designed to interact with a JMAP (JSON Mail Access Protocol) server, allowing you to read emails via the Model Context Protocol (MCP). This project specifically demonstrates integration with a Fastmail JMAP server.
MCP Configuration
To use JMAP-MCP, you need to configure it as an mcpServer in your MCP configuration file. Here is an example configuration:
{
"mcpServers": {
"emails": {
"command": "npx",
"args": ["-y", "@jahfer/jmap-mcp-server"],
"env": {
"JMAP_SESSION_URL": "https://api.fastmail.com/jmap/session", // for example
"JMAP_TOKEN": "<your-jmap-token>"
}
}
}
}
API Token Configuration
You need to set your JMAP API token to authenticate with your email server (e.g., Fastmail). Obtain your API token from your server's settings.
Set the JMAP_SESSION_URL and JMAP_TOKEN environment variables when running the application.
Tools
Once configured in MCP, you can use commands or features within MCP that interact with the server definition to read your emails via the JMAP protocol.
Local Development
Prerequisites: Ensure you have Node.js installed.
Clone the repository: Clone this repository to your local machine.
Install dependencies: Navigate to the project directory and run:
npm install
Installing Jmap
This server has no published package — it is built from source. Open the repository and follow its README.
▸ github.com/jahfer/jmap-mcp-serverFAQ
Is Jmap MCP free?
Yes, Jmap MCP is free — one-click install via Unyly at no cost.
Does Jmap need an API key?
No, Jmap runs without API keys or environment variables.
Is Jmap hosted or self-hosted?
Self-hosted: the server runs locally on your machine via the install command above.
How do I install Jmap in Claude Desktop, Claude Code or Cursor?
Open Jmap on unyly.org, pick your client tab (Claude Desktop, Claude Code, Cursor) and press Install — the config is generated automatically, no JSON editing.
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