Mailboxlayer MCP for AI Agents

Securely connect your AI agents and chatbots (Claude, ChatGPT, Cursor, etc) with Mailboxlayer MCP or direct API to validate email addresses, detect disposable or typo domains, check SMTP deliverability, and enrich emails with quality data through natural language.

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Api Key

Mailboxlayer is a JSON API that validates and verifies email addresses in real time. It helps ensure accurate, deliverable emails and reduces bounce rates for your apps or workflows.

1 Tools

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

TOOL ROUTER PLAYGROUND
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TOOLS

Supported Tools

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

Check Email Validity

Tool to validate a single email address.

SETUP GUIDE

Connect Mailboxlayer MCP Tool with your Agent

1

Install Composio

typescript
npm install @composio/core ai @ai-sdk/openai @ai-sdk/mcp
Install the Composio SDK and Claude Agent SDK
2

Create Tool Router Session

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

const composio = new Composio({ apiKey: 'your-api-key' });

console.log("Creating Tool Router session...");
const { mcp } = await composio.create('your-user-id');
console.log(`Tool Router session created: ${mcp.url}`);
Initialize the Composio client and create a Tool Router session
3

Connect to AI Agent

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

const client = await createMCPClient({
  transport: {
    type: 'http',
    url: mcp.url,
    headers: { 'x-api-key': 'your-composio-api-key' }
  }
});

const tools = await client.tools();

const { text } = await generateText({
  model: openai('gpt-4o'),
  tools,
  messages: [{ role: 'user', content: 'Check if john.doe@example.com is a valid email address' }],
  stopWhen: stepCountIs(5)
});

console.log(`Agent: ${text}`);
Use the MCP server with your AI agent
SETUP GUIDE

Connect Mailboxlayer API Tool with your Agent

1

Install Composio

typescript
npm install @composio/openai
Install the Composio SDK
2

Initialize Composio and Create Tool Router Session

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

const composio = new Composio({
  provider: new OpenAIResponsesProvider(),
});
const openai = new OpenAI({});
const session = await composio.create('your-user-id');
Import and initialize Composio client, then create a Tool Router session
3

Execute Mailboxlayer Tools via Tool Router with Your Agent

typescript
const tools = session.tools;
const response = await openai.responses.create({
  model: 'gpt-4.1',
  tools: tools,
  input: [{
    role: 'user',
    content: 'Verify if john.doe@example.com is a valid email address.'
  }],
});
const result = await composio.provider.handleToolCalls(
  'your-user-id',
  response.output
);
console.log(result);
Get tools from Tool Router session and execute Mailboxlayer actions with your Agent

Why Use Composio?

AI Native Mailboxlayer Integration

  • Supports both Mailboxlayer MCP and direct API based integrations
  • Structured, LLM-friendly schemas for reliable tool execution
  • Rich coverage for real-time email validation and verification

Managed Auth

  • Central place to manage and revoke API keys for Mailboxlayer
  • No more hard-coded credentials—credentials are securely handled for each user
  • Scoped access for different environments and teams

Agent Optimized Design

  • Tools tested on real world email data for consistent validation results
  • Comprehensive logs for every email validation and enrichment attempt

Enterprise Grade Security

  • Fine-grained RBAC controls for Mailboxlayer access
  • Audit trail for every email address checked via agent
  • Least privilege, environment-specific API key access
FAQ

Frequently asked questions

Yes, Mailboxlayer 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.

Composio is SOC 2 and ISO 27001 compliant with all data encrypted in transit and at rest. Learn more.

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

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Managed auth, hosted MCP servers, and every Mailboxlayer tool your agent needs.Free to start.

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