Name: Fastmail MCP
Availability: InStock
Author: radiosilence

What it does

Fastmail MCP connects AI agents directly to Fastmail's JMAP and CardDAV APIs. Instead of numerous small tools, it provides a sophisticated GraphQL interface that allows agents to execute complex, nested queries to fetch emails, manage threads, and handle contacts in a single round-trip.

Tools

graphql: The primary interface to execute any GraphQL query or mutation against the Fastmail API, including searching emails, sending replies, and managing folders.
schema_sdl: Returns the full GraphQL schema (SDL), enabling the AI to discover all available operations and typed arguments dynamically.

Installation

Configure in your MCP client (e.g., Claude Desktop) as follows:

{
  "mcpServers": {
    "fastmail": {
      "command": "mise",
      "args": ["x", "--", "fastmail-cli", "mcp"],
      "env": {
        "FASTMAIL_API_TOKEN": "your-token-here",
        "FASTMAIL_USERNAME": "you@fastmail.com",
        "FASTMAIL_APP_PASSWORD": "your-app-password"
      }
    }
  }
}