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-3": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-fastmail-3"
      ],
      "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 an opinionated JMAP-compliant server for AI agents to manage email, offering a curated set of actions for agent-assisted workflows.

Indexed Date

7/22/2026

License

Open Source

Protocol Layer

stdio / SSE RPC

Frequently Asked Questions

Architecture and operational details for Fastmail

No, while optimized for Fastmail, this server is built entirely to the JMAP standard. It is compatible with any JMAP-compliant email provider, making it versatile for various setups.

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