Fastmail

Verified Integration

Author: @spawning•Category: ServerApplication

GitHub Repository

JSON-RPC 2.0

Protocol Standard

Sub-second

Execution Latency

Active

Operational Status

Client Configuration

— Connect Fastmail to Claude Desktop or Cursor in seconds

{
  "mcpServers": {
    "fastmail-4": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-fastmail-4"
      ],
      "env": {}
    }
  }
}

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows).

Architecture & Capabilities

System Overview

Provides comprehensive management of email, contacts, and calendars for Fastmail accounts via the JMAP protocol.

Indexed Date

7/22/2026

License

Open Source

Protocol Layer

stdio / SSE RPC

Frequently Asked Questions

Architecture and operational details for Fastmail

Yes, it supports full contact listing and searching, as well as managing calendar events, including listing existing events, getting event details, and creating new events within your Fastmail account.

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