rubit-mcp-mail

Name: rubit-mcp-mail
Author: bgalmes

by bgalmesversion 1.0.0i★ –iRuns on your computer

Registry nameio.github.bgalmes/rubit-mcp-mail

Install

Overview

Description from the maker (original English)

Read-only MCP server for your mail — provider-agnostic IMAP that never marks a message as read.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Other

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
The registry lists no key to fill in.

You need

PyPIPython’s uv installed (for the uvx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "rubit-mail": {
      "command": "uvx",
      "args": [
        "rubit-mcp-mail",
        "serve"
      ]
    }
  }
}

Run this in your terminal

claude mcp add rubit-mail -- uvx rubit-mcp-mail serve

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "rubit-mail": {
      "command": "uvx",
      "args": [
        "rubit-mcp-mail",
        "serve"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "rubit-mail": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "rubit-mcp-mail",
        "serve"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account bgalmes, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Otheri

More stars than 0% of the other 18353 servers in this category
Published to the registry more recently than 46% of the other 18353 servers in this category
Basic checks equal to or better than 100% of the other 18353 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is rubit-mcp-mail safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (1.0.0) reached the registry 2 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Python (uv) on your computer.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, Date Math

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

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by formulahendry

MCP Server that facilitates spec-driven development workflows, not just Vibe Coding.

Runs on your computer★ 440MITUpdated 14 months ago

Install

Remote Desktop Commander

by desktop-commander

Remote Desktop Commander: use files, terminal and processes on your own computers from any AI app.

Runs in the cloud★ 211Updated 2 days ago

Install

Date Math

by JowenDelaPena

Date/time math for agents: business days, holidays, time zones, cron, RRULE. 25 free calls/day.

Computer or cloudUpdated today

Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

rubit-mcp-mail

A read-only MCP server for reading your mail. Provider-agnostic: it speaks IMAP, so it works with Outlook.com, Gmail, Fastmail, iCloud, or a self-hosted server — the provider is a line of config, not a code change.

Read-only by construction. Folders are opened with EXAMINE, never SELECT, and bodies are fetched with BODY.PEEK, so reading a message does not even mark it as read. There are no send, move, delete, or flag code paths, and a test asserts none are ever added.

📖 Full documentation: [https://bgalmes.github.io/rubit-mcp-mail/](https://bgalmes.github.io/rubit-mcp-mail/)

Quick install

Download the installer for your system from the latest release and run it:

System	File
Windows	`rubit-mcp-mail-setup-windows.exe`
Linux	`rubit-mcp-mail-setup-linux` — `chmod +x` it first

Nothing needs to be installed beforehand: Python and every dependency are inside that one file. A window asks for your provider and email address, signs you in, and registers the mail server with Claude Desktop and Claude Code if it finds them — restart Claude Desktop afterwards and your mail is there. It also leaves you a rubit-mcp-mail Settings shortcut for everything you want to change later. No terminal, at any point.

There is no macOS installer; on a Mac, install from source (below).

A note on antivirus warnings. Windows Defender or Avast may flag this .exe. This is a known false positive common to unsigned PyInstaller-built applications, not anything this project's code does — see the install guide for what to do about it. Every published SHA-256 is listed on the changelog.

Tools

Tool	What it does
`list_accounts`	Configured accounts and whether each is authenticated
`list_folders`	Folders with normalized roles and unread counts
`list_messages`	Browse a folder, newest first, paginated
`search_messages`	Server-side search by text, sender, subject, date range, unread
`read_message`	Full headers, body text, attachment metadata
`get_attachment`	Save one attachment into the download directory

Folders are addressed by role — inbox, sent, drafts, junk, trash, archive — so you never need to know that Outlook calls it Junk Email while Gmail calls it [Gmail]/Spam. Raw folder names work too.

Full arguments and return shapes: Tools reference.

Install with pip

If you already have Python 3.11+ and would rather not run an installer:

pip install rubit-mcp-mail

rubit-mcp-mail install # the same setup wizard, from the terminal

Install from source

cd /path/to/rubit-mcp-mail

conda create -p ./.venv python=3.12 pip -y # this machine has no python3-venv ./.venv/bin/python -m pip install -e .

Then configure an account, rubit-mcp-mail auth , and rubit-mcp-mail doctor. The Windows variant and the full walkthrough are in Install from source.

Setting up a mailbox

Microsoft has retired basic auth for Outlook.com, so Outlook needs a free Azure app registration — seven steps, done once, written out in Setting up Outlook. Everything else takes an app password:

[accounts.personal]

provider = "generic" email = "you@fastmail.com" host = "imap.fastmail.com"

Known hosts: Gmail imap.gmail.com, Fastmail imap.fastmail.com, iCloud imap.mail.me.com, Yahoo imap.mail.yahoo.com. Gmail and iCloud require an app-specific password, not your login password.

Can't register your own Azure app?

If your Microsoft account genuinely can't register one, you can use the public client ID that other open-source mail tools already share for this purpose — Thunderbird's, 9e5f94bc-e8a4-4e73-b8be-63364c29d753. Paste it in as client_id. The consent screen will say "Thunderbird", and because the ID is outside our control Microsoft could rotate it. Details and caveats: Can't register your own app?.

Permissions

Any account-scoped tool can be forbidden for a given account with disabled_tools in config.toml, or by unticking a box on the settings window's Permissions tab. A blocked call returns a plain Error: ... string to the model rather than failing silently. See Permissions.

Registering with Claude

claude mcp add rubit-mail --scope user -- "$(pwd)/.venv/bin/rubit-mcp-mail" serve

Claude Desktop needs a JSON entry instead, and on Linux it needs the session environment passed explicitly or the keyring is unreachable — Register with Claude has both, and Troubleshooting has the logs.

Agent skill

skills/rubit-mail/SKILL.md tells an agent when to reach for the mail tools and how to chain them, and reminds it that the server is read-only and that mail content is untrusted. For Claude Code, copy it into your user (or a project's .claude/) skills directory:

mkdir -p ~/.claude/skills && cp -r skills/rubit-mail ~/.claude/skills/

Any other agent that reads SKILL.md files works the same way. See Agent skill.

Development

ruff check .

ruff format --check . pyright pytest -q

Those are the same checks CI runs. Commit messages follow Conventional Commits and drive automatic versioning — see CONTRIBUTING.md and AGENTS.md. Building the installers and adding a provider are covered in Contributing.

The website

website/ holds the documentation site (Nuxt), deployed to GitHub Pages by .github/workflows/deploy-website.yml. It is the source of truth for the docs; this README is deliberately the short version.

[!IMPORTANT]

Website commits must not use feat: or fix:. python-semantic-release

parses the commit *type*, not the scope, so feat(site): … would bump the

Python package and cut an installer release. Use docs(site):,

chore(site): or ci(site):.

Layout

src/rubit_mcp_mail/

server.py MCP tool definitions main.py CLI: serve | install | auth | doctor | gui installer.py setup wizard: writes config, signs in, registers with Claude installer_gui.py the setup window (tkinter), falling back to the terminal shortcuts.py Start Menu / Desktop / .desktop entries for the GUI claude_registration.py claude_desktop_config.json / claude mcp add session.py wires config + auth + backend; attachment path safety config.py TOML config -> Account models diagnostics.py the doctor checks, as data (shared by the CLI and the GUI) permissions.py registry of per-account-toggleable tool names config_editor.py every write to config.toml: comment-preserving, validated config_gui.py the settings window (tkinter): accounts, permissions, doctor providers.py provider profile registry secrets.py keyring with 0600-file fallback models.py pydantic models + message handles mime.py BODYSTRUCTURE walking, decoding, HTML->text backends/ base.py MailBackend protocol imap.py the IMAP implementation auth/ password.py app passwords oauth_microsoft.py MSAL device-code flow skills/rubit-mail/SKILL.md agent skill: when and how to use the tools website/ the documentation site (Nuxt); see "The website" above

Releasing

Every merge to main prepares a release PR carrying only the pyproject.toml and CHANGELOG.md diff; a maintainer merges it by hand, which publishes the prerelease and builds the installers; promote-release.yml is dispatched manually to drop the -rc.N suffix. The human merge is load-bearing — GitHub raises no events for anything GITHUB_TOKEN does. Full flow: CONTRIBUTING.md and How releases work.

Notes and limits

IMAP search is substring-based, bodies are truncated at 20,000 characters, only text parts are downloaded, and Microsoft is actively tightening third-party mail access. The details are in Notes and limits.

rubit-mcp-mail

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

Date Math

README from the maker

rubit-mcp-mail

Quick install

Tools

Install with pip

Install from source

Setting up a mailbox

Can't register your own Azure app?

Permissions

Registering with Claude

Agent skill

Development

The website

Layout

Releasing

Notes and limits