mcp4mail MCP server
online · 100% uptimeonline.mcp4mail/mcp4mail·v1.0.0Your IMAP mailbox as an MCP server: read, search and (if you allow it) organize mail. Open source.
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Reviews
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If you have run it, two minutes of your experience saves the next person an afternoon.
mcp4mail tools
Tool list not cached yet. `describe` through the gateway fetches it live.
Public scan report
scanner v0.1.10 · 2026-09-28 · same rubric, same numbers if you re-run it
- –Code scanremote-only server, no package to scann/a
- Live reliabilityremote reachable in 1069ms (auth required)20/20
- –Tool poisoningtools not inspected (endpoint requires auth); not countedn/a
- Auth qualityOAuth resource metadata advertised on 40115/15
- Maintenancelast push 0 days ago15/15
- Maintainer identitynamespace and repository owner differ; GitHub account older than a year; website matches verified namespace8/10
How mcp4mail compares
Against every graded Web search MCP server, from our own scans and uptime checks. Updated after each scan run.
- Safety score
- 97/100
- higher than 98% of 3,470 Web search servers
- Uptime
- 100%
- of our recent checks; the typical remote Web search server answers 100%
- Response time
- 617 ms
- faster than 22% of 2,238 Web search servers
Install mcp4mail in Claude Code, Cursor or VS Code
claude mcp add --transport http mcp4mail https://mcp4mail.online/mcp
What the publisher says
From the mcp4mail repository's README, as published. We do not edit it. Read it on GitHub
mcp4mail
Your mailbox as an MCP server. Connect an IMAP account and let your AI assistant read and search your mail, authorized over OAuth 2.1. Hosted at mcp4mail.online, open source and self-hostable.
Run it yourself and your credentials never leave your machine. A hosted mail connector necessarily keeps your IMAP password on someone else's server; with mcp4mail you can keep it in your own database instead. One docker compose up gets you there: see the self-hosting guide.
Early days: the MCP endpoint lists your connected accounts; reading and searching mail is next.
This project is primarily developed by AI developers orchestrated through mcptask.online. Watch the development happen live: https://mcptask.online/live
How this project is built
This is a real open-source product and, at the same time, a public demonstration. Tasks are written by people in mcptask.online, picked up by runners (Claude Code driven by the mcptask runner, on our own machines), and every change follows the same path: task → branch → pull request → tests & CI → merge → deploy to mcp4mail.online. Nobody, person or runner, pushes to main directly: the branch is protected by a repository ruleset that requires an open pull request, a linear history, and green status checks (security scans, lint, unit tests, system tests) before a squash merge is allowed.
Watch it live: https://mcptask.online/live
Where to look if you want to verify any of this yourself: the Pull requests tab, where each PR links its task and shows its CI runs, including the failed ones; CLAUDE.md and .claude/, the instructions the runners work from; and the CI configuration.
People still write the task briefs, review the pull requests, and decide what ships and what doesn't; a runner executes a task end to end, but it is not deciding what to build. A runner is a user with a seat here, not something free or unlimited.
MCP tools
Write tools work only on a mailbox whose owner switched on "Allow the AI to make changes to this mailbox"; everywhere else they are refused, see below. send_message never sends on its own: you get an email with a link and the message leaves only when you press Send.
Self-hosting
cp .env.example .env # fill in the values
docker compose up -dRead docs/self-hosting.md first: which environment variables matter, why HITCHRESOURCEURI must match your public URL exactly, TLS, and how mailbox passwords are stored.
Stack
Ruby 3.4, Rails 8.1, PostgreSQL, Hotwire (Turbo + Stimulus), Tailwind CSS, Solid Queue / Cache / Cable.
Development
Shortened. The full README is on GitHub.
Nothing above is checked by us. What we check is on the safety report.
mcp4mail: common questions
- Is mcp4mail MCP server safe?
- Yes, by our scan: it is graded A (97/100). Read the mcp4mail safety report
- How do I install mcp4mail?
- It runs remotely at mcp4mail.online. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
- Does mcp4mail need an API key?
- No key to paste: it signs you in with OAuth when your client connects.
- Is mcp4mail maintained?
- The last commit was 37 days ago (2026-09-28). The latest release is v1.0.0.
- Is mcp4mail up?
- 100% of our last 28 checks got an answer. We check remote servers about four times a day.
- What can I use instead of mcp4mail?
- Servers from other publishers that do the same job: Apple Notes MCP server, Apple Mail MCP server and OfficeIMO Document Tools MCP server.
- How does mcp4mail compare with other Web search MCP servers?
- safety score 97/100 (higher than 98% of 3,470 Web search servers); uptime 100% (of our recent checks; the typical remote Web search server answers 100%); response time 617 ms (faster than 22% of 2,238 Web search servers). Full comparison.
Alternatives to mcp4mail
Same job from other publishers: the closest match first, then the best rated.
- Apple NotesInspect, search, create, edit, move, and organize notes in Apple Notes on macOS.not reviewedEstablishedA
- Apple Mail MCPApple Mail MCP server with full-coverage FTS5 body search, reliable on large mailboxes.not reviewedEstablishedA
- OfficeIMO Document ToolsInspect, search, fetch, and convert local documents and mail stores with bounded access.not reviewedGrowingA
