Fastmail MCP Server

Fastmail MCP server is a locally run integration for AI assistants that speak the Model Context Protocol. 🚀 Professional MCP Server for Fastmail email management using JMAP API - Integrates seamlessly with Claude Desktop and other AI assistants.

What you get

We welcome contributions! Please see our Contributing Guide for details.

What the assistant can call

Once Fastmail is connected, these are the calls the assistant has available:

• Token — based Authentication** - No password storage
• Multi — Account Support** - Manage multiple Fastmail accounts
• Documentation — Comprehensive guides and API reference
• Issues — Report bugs or request features on GitHub
• Discussions — Community support and feature discussions
• Fastmail — For their excellent JMAP API
• Anthropic — For the MCP protocol and Claude integration
• Community — For feedback, contributions, and support
• Testing — We welcome contributions! Please see our Contributing Guide for

Setting it up

Setup follows the usual MCP pattern — install or clone the server, register it in your client's configuration file, restart the client.

Choosing this one

Among the developer tooling options, the useful question is rarely "what can it do" but "what does it cost you to run" — permissions, credentials, and how much of your context its toolset consumes. Fastmail's toolset — Token, Multi, Documentation and 6 more — is a fair guide to whether it matches your workflow. It is maintained by alexdiazdecerio; worth a glance at recent repository activity before you build anything load-bearing on it.

SyncDev reviews every entry in this directory against the project's own documentation before publishing, and revisits them as servers change.

Before you rely on it

• It runs with your machine's permissions. That is convenient and also the reason to think about what you point it at before you approve a tool call.
• With 9 tools registered it takes up a noticeable share of the context window; turn it off in projects that never touch Fastmail.
• MCP clients confirm each tool call by default. Leave that on until you have watched what the fastmail mcp server does with a few real requests.