# Mailboxlayer

```json
{
  "name": "Mailboxlayer",
  "slug": "mailboxlayer",
  "url": "https://composio.dev/toolkits/mailboxlayer",
  "markdown_url": "https://composio.dev/toolkits/mailboxlayer.md",
  "logo_url": "https://logos.composio.dev/api/mailboxlayer",
  "categories": [
    "developer tools & devops"
  ],
  "is_composio_managed": false,
  "updated_at": "2026-05-12T10:18:07.340Z"
}
```

![Mailboxlayer logo](https://logos.composio.dev/api/mailboxlayer)

## Description

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.

## Summary

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.

## Categories

- developer tools & devops

## Toolkit Details

- Tools: 1

## Images

- Logo: https://logos.composio.dev/api/mailboxlayer

## Authentication

- **Api Key**
  - Type: `api_key`
  - Description: Api Key authentication for Mailboxlayer.
  - Setup:
    - Configure Api Key credentials for Mailboxlayer.
    - Use the credentials when creating an auth config in Composio.

## Suggested Prompts

- Check if this email address is real
- Validate a list of customer emails
- Verify if a domain accepts emails
- Detect disposable emails before signup

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `MAILBOXLAYER_CHECK_EMAIL` | Check Email Validity | Tool to validate a single email address. Use when you need to check syntax, domain, SMTP, and meta-flags. |

## Supported Triggers

None listed.

## Installation and MCP Setup

### Path 1: SDK Installation

#### Path 1, Step 1: Install Composio

Install the Composio SDK
```python
pip install composio_openai
```

```typescript
npm install @composio/openai
```

#### Path 1, Step 2: Initialize Composio and Create Tool Router Session

Import and initialize Composio client, then create a Tool Router session
```python
from openai import OpenAI
from composio import Composio
from composio_openai import OpenAIResponsesProvider

composio = Composio(provider=OpenAIResponsesProvider())
openai = OpenAI()
session = composio.create(user_id='your-user-id')
```

```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');
```

#### Path 1, Step 3: Execute Mailboxlayer Tools via Tool Router with Your Agent

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

```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);
```

### Path 2: MCP Server Setup

#### Path 2, Step 1: Install Composio

Install the Composio SDK and Claude Agent SDK
```python
pip install composio claude-agent-sdk
```

```typescript
npm install @composio/core ai @ai-sdk/openai @ai-sdk/mcp
```

#### Path 2, Step 2: Create Tool Router Session

Initialize the Composio client and create a Tool Router session
```python
from composio import Composio
from claude_agent_sdk import ClaudeSDKClient, ClaudeAgentOptions

composio = Composio(api_key='your-composio-api-key')
session = composio.create(user_id='your-user-id')
url = session.mcp.url
```

```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}`);
```

#### Path 2, Step 3: Connect to AI Agent

Use the MCP server with your AI agent
```python
import asyncio

options = ClaudeAgentOptions(
    permission_mode='bypassPermissions',
    mcp_servers={
        'tool_router': {
            'type': 'http',
            'url': url,
            'headers': {
                'x-api-key': 'your-composio-api-key'
            }
        }
    },
    system_prompt='You are a helpful assistant with access to Mailboxlayer tools.',
    max_turns=10
)

async def main():
    async with ClaudeSDKClient(options=options) as client:
        await client.query('Check if john.doe@example.com is a valid email address')
        async for message in client.receive_response():
            if hasattr(message, 'content'):
                for block in message.content:
                    if hasattr(block, 'text'):
                        print(block.text)

asyncio.run(main())
```

```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}`);
```

## Why Use Composio?

### 1. 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

### 2. 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

### 3. Agent Optimized Design

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

### 4. 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

## Use Mailboxlayer with any AI Agent Framework

Choose a framework you want to connect Mailboxlayer with:

- [OpenAI Agents SDK](https://composio.dev/toolkits/mailboxlayer/framework/open-ai-agents-sdk)
- [Claude Agent SDK](https://composio.dev/toolkits/mailboxlayer/framework/claude-agents-sdk)
- [Claude Code](https://composio.dev/toolkits/mailboxlayer/framework/claude-code)
- [Claude Cowork](https://composio.dev/toolkits/mailboxlayer/framework/claude-cowork)
- [Codex](https://composio.dev/toolkits/mailboxlayer/framework/codex)
- [OpenClaw](https://composio.dev/toolkits/mailboxlayer/framework/openclaw)
- [Hermes](https://composio.dev/toolkits/mailboxlayer/framework/hermes-agent)
- [Google ADK](https://composio.dev/toolkits/mailboxlayer/framework/google-adk)
- [LangChain](https://composio.dev/toolkits/mailboxlayer/framework/langchain)
- [Vercel AI SDK](https://composio.dev/toolkits/mailboxlayer/framework/ai-sdk)
- [Mastra AI](https://composio.dev/toolkits/mailboxlayer/framework/mastra-ai)
- [LlamaIndex](https://composio.dev/toolkits/mailboxlayer/framework/llama-index)
- [CrewAI](https://composio.dev/toolkits/mailboxlayer/framework/crew-ai)
- [Pydantic AI](https://composio.dev/toolkits/mailboxlayer/framework/pydantic-ai)
- [AutoGen](https://composio.dev/toolkits/mailboxlayer/framework/autogen)

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- [Baserow](https://composio.dev/toolkits/baserow) - Baserow is an open-source no-code database platform for building collaborative data apps. It makes it easy for teams to organize data and automate workflows without writing code.
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## Frequently Asked Questions

### Do I need my own developer credentials to use Mailboxlayer with Composio?

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.

### Can I use multiple toolkits together?

Yes! Composio's Tool Router enables agents to use multiple toolkits. [Learn more](https://docs.composio.dev/tool-router/overview).

### Is Composio secure?

Composio is SOC 2 and ISO 27001 compliant with all data encrypted in transit and at rest. [Learn more](https://trust.composio.dev).

### What if the API changes?

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

---
[See all toolkits](https://composio.dev/toolkits) · [Composio docs](https://docs.composio.dev/llms.txt)