Mail Fathom MCP Server

A brain for your mail - self-hosted, AI-native, and yours alone. MailFathom synchronizes your IMAP accounts into a PostgreSQL database you run, indexes that copy, and serves it to AI agents as tools over the Model Context Protocol. Reading answers from your copy rather than from a mail server, and it never marks anything read there. Writing - marking, drafting, sending - is a separate act each account and each…

Teams that work with aspnet core, clean architecture and dotnet and want a hosted endpoint instead of running a local process. The project is written in C#.

VERIFIED ACTIVE

LAST COMMIT 2026-09-17 · ★ 14 · #61 OF 90 MAINTAINED EMAIL · VERIFIED 2026-09-18

AGPL-3.0 · C# · how we verify → /methodology

01 · Install Mail Fathom

Claude Code

claude mcp add krzysztof318-mailfathom --transport http https://{mailfathom_host}/mcp

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "krzysztof318-mailfathom": {
      "url": "https://{mailfathom_host}/mcp"
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

https://{mailfathom_host}/mcp

transport: streamable-http

endpoint NOT responding · probed 2026-09-18

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as remote - your agent's requests go to {mailfathom_host}

repo age created 2026-07-22 - young repo, little track record yet

license AGPL-3.0 - declared in the repository

registry namespace io.github.Krzysztof318 is GitHub-verified and matches the repo owner

03 · What Mail Fathom can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

Latest releases

v0.7.0 · 2026-08-20

The seventh release, and the first one that sends mail. Until now everything an agent could reach either read your · local copy or changed a flag on your own server; from here it can compose a message and have…

v0.6.0 · 2026-08-14

The sixth release, and the first one that does something with your mail rather than only reading it. Rules you write · in a configuration file move, copy, delete, and mark messages as read; a spam classification files…

v0.5.0 · 2026-08-10

The fifth release, and the one that lets a client ask about your mail rather than only look through it. ask_mail · answers a question in prose and cites the messages the answer was drawn from, and search_emails ranks…

04 · Who maintains Mail Fathom

MailFathom is maintained by krzysztof318. It's the only MCP server we track from this author; the repo dates to Jul 2026.

05 · Facts

repository: github.com/krzysztof318/mailfathom
website: https://krzysztof318.github.io/MailFathom/
category: email - ranked #61 of 90 actively-maintained email servers as of 2026-09-18.
release cadence: 7 releases in the last 90 days (latest 2026-08-20)
registry: io.github.Krzysztof318/mailfathom (active, first published 2026-08-14 · 2 versions)

06 · Mail Fathom FAQ

What is Mail Fathom?

Is Mail Fathom still maintained?

Yes - as of 2026-09-18, its last commit was 2026-09-17 and it shipped 7 releases in the last 90 days. We re-verify nightly.

How do I install Mail Fathom?

Run `claude mcp add krzysztof318-mailfathom --transport http https://{mailfathom_host}/mcp`. You can also paste the ready-made client config above.

07 · Alternatives to Mail Fathom

Alternatives to Mail Fathom

Maintained email servers if Mail Fathom isn't the fit.

More email MCP servers · Outlook Assistant · Inbox Check - Email Deliverability Test · Qorami · BlackVeil DNS & Email Security Scanner · Proactive MCP