Mailboxlayer Integration 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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Supported Tools

Tools
Check Email ValidityTool to validate a single email address.

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

Connect Mailboxlayer MCP Tool with your Agent

Python
TypeScript

Install Composio

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

Create 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
Initialize the Composio client and create a Tool Router session

Connect to 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())
Use the MCP server with your AI agent

Connect Mailboxlayer API Tool with your Agent

Python
TypeScript

Install Composio

python
pip install composio_openai
Install the Composio SDK

Initialize Composio and Create 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')
Import and initialize Composio client, then create a Tool Router session

Execute Mailboxlayer Tools via Tool Router 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)
Get tools from Tool Router session and execute Mailboxlayer actions with your Agent

Use Mailboxlayer with any AI Agent Framework

Choose a Framework you want to connect Mailboxlayer with

OpenAI Agents SDK

OpenAI Agents SDK

Use Mailboxlayer MCP with OpenAI Agents SDK

Claude Agents SDK

Claude Agents SDK

Use Mailboxlayer MCP with Claude Agents SDK

Google ADK

Google ADK

Use Mailboxlayer MCP with Google ADK

Langchain

Langchain

Use Mailboxlayer MCP with Langchain

AI SDK

AI SDK

Use Mailboxlayer MCP with AI SDK

Mastra AI

Mastra AI

Use Mailboxlayer MCP with Mastra AI

LlamaIndex

LlamaIndex

Use Mailboxlayer MCP with LlamaIndex

CrewAI

CrewAI

Use Mailboxlayer MCP with CrewAI

Pydantic AI

Pydantic AI

Use Mailboxlayer MCP with Pydantic AI

Autogen

Autogen

Use Mailboxlayer MCP with Autogen

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.

Is Composio secure?

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

What if the API changes?

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

Used by agents from

Context
ASU
Letta
glean
HubSpot
Agent.ai
Altera
DataStax
Entelligence
Rolai
Context
ASU
Letta
glean
HubSpot
Agent.ai
Altera
DataStax
Entelligence
Rolai
Context
ASU
Letta
glean
HubSpot
Agent.ai
Altera
DataStax
Entelligence
Rolai

Never worry about agent reliability

We handle tool reliability, observability, and security so you never have to second-guess an agent action.

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