Mx toolbox MCP server for AI agents and assistants

Securely connect your AI agents and chatbots (Claude, ChatGPT, Cursor, etc) with Mx toolbox MCP or direct API to run DNS lookups, check domain blacklists, analyze email server health, and monitor network issues through natural language.

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Api Key

MxToolbox is a network diagnostic and monitoring service with advanced DNS, blacklist, and email health tools. It helps IT teams quickly troubleshoot and ensure reliable email and network performance.

13 Tools

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Type what you want done — sign in and watch it run live in the Tool Router playground.

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TOOLS

Supported Tools

Every Mx toolbox action and event your agent gets out of the box.

Lookup BIMI Record

Retrieves BIMI (Brand Indicators for Message Identification) record and diagnostic information for a domain.

Lookup Blacklist

Tool to perform a blacklist check on a domain or IP.

Lookup DKIM Record

Tool to retrieve DKIM (DomainKeys Identified Mail) records for a domain.

Lookup DMARC Record

Retrieves DMARC (Domain-based Message Authentication, Reporting & Conformance) records for a domain and performs validation checks.

Lookup DNS Records

Performs comprehensive DNS health check and retrieves name server records for a domain.

HTTP Lookup

Tool to perform an HTTP test on a domain.

Lookup MTA-STS Record

Tool to lookup MTA-STS record for a domain.

Lookup MX Records

Retrieves MX (Mail Exchange) records for a domain.

Ping Lookup

Performs a ping test to check network connectivity and measure round-trip time to a domain or IP address.

SMTP Lookup

Tool to perform an SMTP connectivity test on a domain.

Lookup SPF Record

Tool to retrieve SPF records for a specified domain.

Monitor Status

Retrieves the current status of all monitors configured in the MX Toolbox account.

Check Usage

Retrieve API usage statistics for DNS and network lookups.

SETUP GUIDE

Connect Mx toolbox MCP Tool with your Agent

1

Install Composio

typescript
npm install @composio/core ai @ai-sdk/mcp @ai-sdk/openai
Install the Composio SDK and your agent framework
2

Create a session with MCP enabled

typescript
import { Composio } from "@composio/core";

const composio = new Composio();
const { mcp } = await composio.create("your-user-id", {
  toolkits: ["mx_toolbox"],
  mcp: true,
});
Create a session scoped to Mx toolbox and read its MCP URL and headers
3

Connect your agent to the MCP server

typescript
import { createMCPClient } from "@ai-sdk/mcp";
import { openai } from "@ai-sdk/openai";
import { generateText, stepCountIs } from "ai";

const client = await createMCPClient({
  transport: { type: "http", url: mcp.url, headers: mcp.headers },
});

const { text } = await generateText({
  model: openai("gpt-5.6-sol"),
  tools: await client.tools(),
  prompt: "Check if example.com is blacklisted on major DNSBLs",
  stopWhen: stepCountIs(10),
});

console.log(text);
await client.close();
Pass the session's MCP URL and headers to your agent and run a Mx toolbox request
SETUP GUIDE

Connect Mx toolbox API Tool with your Agent

1

Install Composio

typescript
npm install @composio/core @composio/openai openai
Install the Composio SDK, the OpenAI provider, and the OpenAI SDK
2

Create a Composio session

typescript
import OpenAI from "openai";
import { Composio } from "@composio/core";
import { OpenAIResponsesProvider } from "@composio/openai";

const composio = new Composio({ provider: new OpenAIResponsesProvider() });
const client = new OpenAI();

const session = await composio.create("your-user-id", { toolkits: ["mx_toolbox"] });
const tools = await session.tools();
Initialize Composio with the OpenAI Responses provider and create a session scoped to Mx toolbox
3

Run Mx toolbox tools with your agent

typescript
let response = await client.responses.create({
  model: "gpt-5.6-sol",
  tools,
  input: [{ role: "user", content: "Check if example.com is blacklisted on major DNSBLs" }],
});

while (response.output.some((o) => o.type === "function_call")) {
  const outputs = await composio.provider.handleToolCalls(session, response.output);
  response = await client.responses.create({
    model: "gpt-5.6-sol",
    tools,
    previous_response_id: response.id,
    input: outputs,
  });
}

console.log(response.output_text);
Send a request, execute the Mx toolbox tool calls through the session, and print the final answer

Why Use Composio?

AI Native Mx toolbox Integration

  • Supports both Mx toolbox MCP and direct API based integrations
  • Structured, LLM-friendly schemas for reliable tool execution
  • Rich coverage for DNS records, blacklist checks, email diagnostics, and more

Managed Auth

  • Built-in API key management for Mx toolbox
  • Central place to manage, scope, and revoke access
  • Per user and per environment credentials so you never share API keys

Agent Optimized Design

  • Tools are tuned using real error and success rates for better automation
  • Comprehensive execution logs so you always know what ran and when

Enterprise Grade Security

  • Fine-grained RBAC to control which agents and users can access Mx toolbox
  • Scoped, least privilege access to your Mx toolbox resources
  • Full audit trail for all agent-triggered diagnostic actions

Rolling this out across your team?

Give your team centralized access control across every framework with Composio’s MCP Gateway.

EXPLORE MCP GATEWAY
FAQ

Frequently asked questions

Yes, Mx toolbox requires you to configure your own API key credentials. Once set up, Composio handles secure credential storage and API request handling for you.

Yes! Composio's Tool Router enables agents to use multiple toolkits. Learn more.

Yes. Composio is SOC 2 Type II compliant and is built to keep your Mx toolbox connection and credentials secure. OAuth tokens and API keys are encrypted, and sensitive customer data is protected at rest and in transit.

Composio also undergoes independent security testing and continuously monitors its systems for security threats. You can review the latest reports and policies in the Composio Trust Center.

Composio maintains and updates all toolkit integrations automatically, so your agents always work with the latest API versions.

Create the key in your Mx toolbox account settings, then paste it once on Composio's connection page. Composio stores it encrypted and uses it only for the Mx toolbox actions your agent runs. Nobody else in your workspace can read it, and you can revoke it inside Mx toolbox at any time.

When you connect a Mx toolbox account through Composio, every action runs under that account, so anything the agent creates, sends, or changes shows up in Mx toolbox as done by you. Keep an approval step in your prompt for actions with side effects, such as sending or deleting, and have the agent draft first.

Whatever the credentials you connect allow inside Mx toolbox. If Mx toolbox lets you scope a key to specific permissions, create a scoped one so the agent can only do what you intend. You can revoke the key inside Mx toolbox at any time.

Yes. Composio supports multiple connected accounts for the same app, and that works in Claude, ChatGPT, or any other assistant you connect through Composio. Give each Mx toolbox connection a name such as work or personal, and the assistant uses the one you mention in the request. Each account keeps its own credentials and nothing is merged.

The connection stops working the moment Mx toolbox rejects the old key. Create a new key in Mx toolbox and reconnect the account from the Composio dashboard or by asking your agent to reconnect Mx toolbox. Nothing else changes.

Composio's free Hobby plan includes 100,000 tool calls per month with no credit card, which covers most personal Mx toolbox use. Paid plans add higher limits and team features. Your Mx toolbox plan and its API limits still apply as usual.

Built-in connectors usually give one AI access to a limited set of apps. Many people use Composio because it lets their AI connect to more apps than it normally supports, or connect to multiple accounts for the same app (e.g. connect Claude to multiple Mx toolbox accounts).

With Composio, you connect Mx toolbox once and then use it across different AI assistants without setting it up separately in each one. Connect your apps to Composio once, then connect Composio to whichever AI you use, whether that's Claude, ChatGPT, Hermes, or your own custom assistant.

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