# Domain Deliverability Checker MCP Server

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An MCP server that exposes the Mamba Labs Domain Deliverability Checker as a single tool. Install one package and give your MCP client a way to audit any domain's email deliverability and DNS health, wrapping the Mamba Labs actor on Apify and returning Clay-ready flat JSON.

## What's Inside

- [What it does](#what-it-does)
- [Quick start](#quick-start)
- [Prerequisites](#prerequisites)
- [Example prompts](#example-prompts)
- [Tool and inputs](#tool-and-inputs)
- [Full actor documentation](#full-actor-documentation)
- [Mamba Labs GTM Suite](#mamba-labs-gtm-suite)
- [License](#license)

## What it does

This server gives an AI client one tool:

- `check_domain_deliverability`: audit a domain's SPF, DKIM, DMARC, MX, mail provider, DNS blacklist status, catch-all, domain age, and a 0 to 100 deliverability score.

All of the work runs on Apify. This package is a thin client that routes the tool call to the actor and hands back the result.

## Quick start

You need Node.js 18 or newer and an Apify account with an API token.

Add this to your Claude Desktop config:

```json
{
  "mcpServers": {
    "mamba-domain-deliverability-checker": {
      "command": "npx",
      "args": ["-y", "@mambalabsdev/mcp-domain-deliverability-checker"],
      "env": {
        "APIFY_TOKEN": "your-apify-token"
      }
    }
  }
}
```

Get your token at https://console.apify.com/account/integrations, paste it in, and restart Claude Desktop. The tool will be available.

## Prerequisites

- Node.js 18 or newer
- An Apify account with an API token

## Example prompts

- "Check the email deliverability of stripe.com."
- "Does github.com have SPF, DKIM, and DMARC set up, and what is its DMARC policy?"
- "Audit these domains for deliverability: stripe.com, notion.so, figma.com."
- "Is acme.com on any DNS blacklist, and what is its mail provider?"

## Tool and inputs

`check_domain_deliverability`:

- `domain` (string): bare domain to audit, e.g. stripe.com. Provide this or `domains`.
- `domains` (array): list of bare domains for batch processing. Takes precedence over `domain`.
- `batchSize` (number): domains audited concurrently per wave in batch mode. Default 5, maximum 10.
- `skipCache` (boolean): force a fresh audit and ignore the 24 hour result cache.
- `attempt_catch_all` (boolean): run the SMTP catch-all probe. Off by default; the Apify platform blocks port 25, so it returns unknown there.

## Full actor documentation

For the complete input and output reference, pricing, and run history, see the Domain Deliverability Checker actor on the Apify Store (canonical immutable Actor ID URL):

https://apify.com/mambalabs/0tVgxI7A6o9jMlxmc

---

## Mamba Labs GTM Suite

This server is part of the **Mamba Labs GTM Suite**, a fleet of twelve specialized MCP servers for go-to-market signal intelligence, each backed by a dedicated Apify actor.

| Actor | Immutable Actor ID |
|---|---|
| [GTM Hiring Signal Scraper](https://console.apify.com/actors/D7O1SA2EqwHGsGr1P) | `D7O1SA2EqwHGsGr1P` |
| [GTM Tech Stack Signal Enrichment](https://console.apify.com/actors/qyd7nNyqFPelQViBx) | `qyd7nNyqFPelQViBx` |
| [GTM Signals Aggregator](https://console.apify.com/actors/xKdRfnfFNkdMpFuNs) | `xKdRfnfFNkdMpFuNs` |
| [Job Board Keyword Signal Scanner](https://console.apify.com/actors/4DvqpvhMR74NLcDDY) | `4DvqpvhMR74NLcDDY` |
| [Domain to LinkedIn URL Resolver](https://console.apify.com/actors/3HtnSaqPHOg1Qg5gx) | `3HtnSaqPHOg1Qg5gx` |
| [ICP Fit Scorer](https://console.apify.com/actors/W161DT8W4kW55dMFh) | `W161DT8W4kW55dMFh` |
| [Domain Deliverability Checker](https://console.apify.com/actors/0tVgxI7A6o9jMlxmc) | `0tVgxI7A6o9jMlxmc` |
| [Company Firmographic Enricher](https://console.apify.com/actors/YlUtLWjfPpqykmB8g) | `YlUtLWjfPpqykmB8g` |
| [Company Social Presence Mapper](https://console.apify.com/actors/4k6CCemkgBDz18m2h) | `4k6CCemkgBDz18m2h` |
| [Company Identity Resolver](https://console.apify.com/actors/lr8fTRAmZCBZmuwwh) | `lr8fTRAmZCBZmuwwh` |
| [Company Change-Event Feed](https://console.apify.com/actors/oX44rS0fkEJ3rXLWe) | `oX44rS0fkEJ3rXLWe` |
| [Funding & Press Signal Scanner](https://console.apify.com/actors/FS13X6dhQVgX3XOM6) | `FS13X6dhQVgX3XOM6` |

> Built by [Mamba Labs](https://github.com/mambalabsdev) | [npm](https://www.npmjs.com/org/mambalabsdev) | [Apify Store](https://apify.com/mambalabs)

## License

MIT

Built by Mamba Labs. https://apify.com/mambalabs