MX Probe MCP Server

Email verification for AI agents. One call returns send, hold or kill for an address, with the reason. Signup and credits happen by API too, so an outreach agent can provision itself. No form, no CAPTCHA, no dashboard. It runs locally over stdio via the published package.

People who work with email and smtp and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in TypeScript.

VERIFIED ACTIVE

LAST COMMIT 2026-09-15 · ★ 2 · #26 OF 90 MAINTAINED EMAIL · VERIFIED 2026-09-18

MIT · TypeScript servers · how we verify → /methodology

01 · Install MX Probe

Claude Code

claude mcp add andrewchmr-mxprobe -- npx -y mxprobe

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "andrewchmr-mxprobe": {
      "command": "npx",
      "args": [
        "-y",
        "mxprobe"
      ]
    }
  }
}

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

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 local process (stdio) - runs on your machine with your user's permissions

repo age created 2026-09-09 - young repo, little track record yet

license MIT - declared in the repository

npm package mxprobe - unscoped; check the name against the project README before installing

registry vendor namespace dev.mxprobe - domain-verified with the official MCP registry

03 · What MX Probe can do

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

Latest releases

v0.2.5 · 2026-09-15

MCPB bundle for Smithery: manifest and build script · drop the stale directory sentence · glama.json: maintainers, for the Glama listing · MCP tools: all four annotation hints on every tool · Bump to 0.2.5 · mxprobe…

v0.2.4 · 2026-09-13

version 0.2.3, with the packages · Bump to 0.2.4; MCP Registry namespace dev.mxprobe, proven by the well-known auth file · mxprobe 0.2.4, mxprobe-core 0.2.4

v0.2.3 · 2026-09-13

link previews, robots, sitemap, JSON-LD, OpenAPI, llms-full.txt, security.txt; MCP Registry manifest · Bump to 0.2.3 · mxprobe 0.2.3, mxprobe-core 0.2.3

04 · Who maintains MX Probe

MX Probe is maintained by andrewchmr. We track 2 MCP servers from andrewchmr - 2 actively maintained, 4 combined GitHub stars, oldest repo from Jun 2026. Full record: all servers from andrewchmr.

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05 · Facts

repository: github.com/andrewchmr/mxprobe
website: https://mxprobe.dev/
category: email - ranked #26 of 90 actively-maintained email servers as of 2026-09-18.
release cadence: 7 releases in the last 90 days (latest 2026-09-15)
registry: dev.mxprobe/mxprobe (active, first published 2026-09-13 · 2 versions)
packages: npm:mxprobe

06 · MX Probe FAQ

What is MX Probe?

Is MX Probe still maintained?

Yes - as of 2026-09-18, its last commit was 2026-09-15 and it shipped 7 releases in the last 90 days. We re-verify nightly.

How do I install MX Probe?

Run `npx -y mxprobe`. You can also paste the ready-made client config above.

Does MX Probe run locally?

Yes - it's a stdio server: it runs on your machine (via npx) with your user's permissions. Your data stays local unless the server itself calls external APIs.

07 · Alternatives to MX Probe

Alternatives to MX Probe

Maintained email servers if MX Probe isn't the fit.

More email MCP servers · EWS Meeting MCP · Hyades · Gmail MCP Server · Expense

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