Click on "Install Server".
Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state.
In the chat, type @ followed by the MCP server name and your instructions, e.g., "@mxprobe check if john@example.com is safe to send to"
That's it! The server will respond to your query, and you can continue using it as needed.
Here is a step-by-step guide with screenshots.
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.
Site and docs: https://mxprobe.dev
API: https://api.mxprobe.dev (it describes itself on GET /)
npm: mxprobe (CLI + MCP server), mxprobe-core (the engine)
npx mxprobe check hello@example.com # free DNS tier, local, no key
npx mxprobe check --hosted hello@example.com # survivors go to the hosted SMTP probe
claude mcp add mxprobe -- npx -y mxprobe mcp # the MCP server{
"email": "hello@example.com",
"action": "send",
"verdict": "OK",
"reason": "mailbox accepted by aspmx.l.google.com",
"checks": { "syntax": true, "mx": "aspmx.l.google.com", "smtp": "accepted", "catch_all": false }
}action is send, hold or kill; verdict is OK, WEAK or DEAD. A
hold never becomes a kill on a refusal, a greylist or a catch-all. Only a
5xx that names the mailbox kills.
Path | What |
| The engine: DNS tier, SMTP probe, the verdict contract and the API's wire types. Zero dependencies. |
| `npx mxprobe check |
| The hosted API: |
| The landing page, static. |
| Caddyfile, systemd units, the install script and the runbook. |
Related MCP server: sabit-mcp
Everything is TypeScript (strict, ESM). Each package compiles its src/ to
dist/ with tsc -b; the published packages ship dist/ only. mxprobe and
the server import mxprobe-core through the workspace link to its dist/,
so pnpm build at the root (which runs the packages in dependency order) must
come before a single package's test or typecheck. Tests are .ts files
that Node runs directly with its built-in type stripping.
pnpm install
pnpm build # tsc -b in each package, core first
pnpm test # builds, then: fake resolver, fake SMTP server, in-memory SQLite. No network.
pnpm typecheck # the sources and the tests, without emitting
pnpm test:live # the DNS tier against the real network
pnpm check a@b.com # the CLI from this checkout
cp server/.env.example server/.env && pnpm dev:serverNode 22.18 or newer (24 recommended) to develop and to run the tests; the
compiled engine and CLI run on Node 20, the server on 22.13 or newer
(node:sqlite).
100 checks free at signup, then 9 USD per 10,000, one payment, credits never expire. Addresses are logged for 24 hours for debugging and then deleted.
MIT.
Recent tool additions, removals, and schema changes observed during successful MCP inspections. Dates show when Glama detected each change.
No tool schema history has been recorded yet.
This server cannot be installed
Unclaimed servers have limited discoverability.
If you are the server author, to access and configure the admin panel.
Email verification for AI agents — verify, clean & validate emails; self-onboard + crypto pay
Email for AI agents: send mail, manage contacts, automations & webhooks. Zero-DNS first send.
Email for AI agents — send, receive as a webhook, manage domains, templates, routing.
Email for AI agents: send, read replies as threads, run campaigns, with per-key limits.
