# How to integrate Mailcheck MCP with Autogen ```json { "title": "How to integrate Mailcheck MCP with Autogen", "toolkit": "Mailcheck", "toolkit_slug": "mailcheck", "framework": "AutoGen", "framework_slug": "autogen", "url": "https://composio.dev/toolkits/mailcheck/framework/autogen", "markdown_url": "https://composio.dev/toolkits/mailcheck/framework/autogen.md", "updated_at": "2026-05-12T10:18:09.362Z" } ``` ## Introduction This guide walks you through connecting Mailcheck to AutoGen using the Composio tool router. By the end, you'll have a working Mailcheck agent that can check if this email address is valid, verify a list of customer emails, test deliverability for a new subscriber through natural language commands. This guide will help you understand how to give your AutoGen agent real control over a Mailcheck account through Composio's Mailcheck MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved. ## Also integrate Mailcheck with - [OpenAI Agents SDK](https://composio.dev/toolkits/mailcheck/framework/open-ai-agents-sdk) - [Claude Agent SDK](https://composio.dev/toolkits/mailcheck/framework/claude-agents-sdk) - [Claude Code](https://composio.dev/toolkits/mailcheck/framework/claude-code) - [Claude Cowork](https://composio.dev/toolkits/mailcheck/framework/claude-cowork) - [Codex](https://composio.dev/toolkits/mailcheck/framework/codex) - [OpenClaw](https://composio.dev/toolkits/mailcheck/framework/openclaw) - [Hermes](https://composio.dev/toolkits/mailcheck/framework/hermes-agent) - [CLI](https://composio.dev/toolkits/mailcheck/framework/cli) - [Google ADK](https://composio.dev/toolkits/mailcheck/framework/google-adk) - [LangChain](https://composio.dev/toolkits/mailcheck/framework/langchain) - [Vercel AI SDK](https://composio.dev/toolkits/mailcheck/framework/ai-sdk) - [Mastra AI](https://composio.dev/toolkits/mailcheck/framework/mastra-ai) - [LlamaIndex](https://composio.dev/toolkits/mailcheck/framework/llama-index) - [CrewAI](https://composio.dev/toolkits/mailcheck/framework/crew-ai) ## TL;DR Here's what you'll learn: - Get and set up your OpenAI and Composio API keys - Install the required dependencies for Autogen and Composio - Initialize Composio and create a Tool Router session for Mailcheck - Wire that MCP URL into Autogen using McpWorkbench and StreamableHttpServerParams - Configure an Autogen AssistantAgent that can call Mailcheck tools - Run a live chat loop where you ask the agent to perform Mailcheck operations ## What is AutoGen? Autogen is a framework for building multi-agent conversational AI systems from Microsoft. It enables you to create agents that can collaborate, use tools, and maintain complex workflows. Key features include: - Multi-Agent Systems: Build collaborative agent workflows - MCP Workbench: Native support for Model Context Protocol tools - Streaming HTTP: Connect to external services through streamable HTTP - AssistantAgent: Pre-built agent class for tool-using assistants ## What is the Mailcheck MCP server, and what's possible with it? The Mailcheck MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Mailcheck account. It provides structured and secure access to email verification tools, so your agent can validate email addresses, ensure email deliverability, and reduce bounce rates automatically on your behalf. - Real-time email verification: Instantly check if a provided email address is valid, reducing the risk of sending to invalid contacts. - Bulk verification support: Allow your agent to verify multiple email addresses in one go, streamlining large-scale list cleaning. - Deliverability assurance: Ensure that your outbound emails reach real inboxes by validating addresses before sending campaigns or notifications. - Fraud and spam prevention: Detect and filter out suspicious or disposable email addresses to protect your business from fraudulent signups or spam accounts. ## Supported Tools | Tool slug | Name | Description | |---|---|---| | `MAILCHECK_VALIDATE_DOMAIN` | Validate Domain | Tool to validate a domain for disposability, MX records, domain age, and spam indicators. Use when checking if a domain is associated with temporary email services, public email providers, or forwarding services. | | `MAILCHECK_MAILCHECK_VERIFY_EMAIL` | Verify Email Address | Tool to verify provided email address. Use after obtaining user email input. | ## Supported Triggers None listed. ## Creating MCP Server - Stand-alone vs Composio SDK The Mailcheck MCP server is an implementation of the Model Context Protocol that connects your AI agents and assistants directly to Mailcheck. Instead of manually wiring Mailcheck APIs, OAuth, and scopes yourself, you get a structured, tool-based interface that an LLM can call safely. With Composio's managed implementation, you don't have to create your own developer app. For production, if you're building an end product, we recommend using your own credentials. The managed server helps you prototype fast and go from 0-1 faster. ## Step-by-step Guide ### 1. Prerequisites You will need: - A Composio API key - An OpenAI API key (used by Autogen's OpenAIChatCompletionClient) - A Mailcheck account you can connect to Composio - Some basic familiarity with Autogen and Python async ### 1. Getting API Keys for OpenAI and Composio OpenAI API Key - Go to the [OpenAI dashboard](https://platform.openai.com/settings/organization/api-keys) and create an API key. You'll need credits to use the models, or you can connect to another model provider. - Keep the API key safe. Composio API Key - Log in to the [Composio dashboard](https://dashboard.composio.dev?utm_source=toolkits&utm_medium=framework_docs). - Navigate to your API settings and generate a new API key. - Store this key securely as you'll need it for authentication. ### 2. Install dependencies Install Composio, Autogen extensions, and dotenv. What's happening: - composio connects your agent to Mailcheck via MCP - autogen-agentchat provides the AssistantAgent class - autogen-ext-openai provides the OpenAI model client - autogen-ext-tools provides MCP workbench support ```bash pip install composio python-dotenv pip install autogen-agentchat autogen-ext-openai autogen-ext-tools ``` ### 3. Set up environment variables Create a .env file in your project folder. What's happening: - COMPOSIO_API_KEY is required to talk to Composio - OPENAI_API_KEY is used by Autogen's OpenAI client - USER_ID is how Composio identifies which user's Mailcheck connections to use ```bash COMPOSIO_API_KEY=your-composio-api-key OPENAI_API_KEY=your-openai-api-key USER_ID=your-user-identifier@example.com ``` ### 4. Import dependencies and create Tool Router session What's happening: - load_dotenv() reads your .env file - Composio(api_key=...) initializes the SDK - create(...) creates a Tool Router session that exposes Mailcheck tools - session.mcp.url is the MCP endpoint that Autogen will connect to ```python import asyncio import os from dotenv import load_dotenv from composio import Composio from autogen_agentchat.agents import AssistantAgent from autogen_ext.models.openai import OpenAIChatCompletionClient from autogen_ext.tools.mcp import McpWorkbench, StreamableHttpServerParams load_dotenv() async def main(): # Initialize Composio and create a Mailcheck session composio = Composio(api_key=os.getenv("COMPOSIO_API_KEY")) session = composio.create( user_id=os.getenv("USER_ID"), toolkits=["mailcheck"] ) url = session.mcp.url ``` ### 5. Configure MCP parameters for Autogen Autogen expects parameters describing how to talk to the MCP server. That is what StreamableHttpServerParams is for. What's happening: - url points to the Tool Router MCP endpoint from Composio - timeout is the HTTP timeout for requests - sse_read_timeout controls how long to wait when streaming responses - terminate_on_close=True cleans up the MCP server process when the workbench is closed ```python # Configure MCP server parameters for Streamable HTTP server_params = StreamableHttpServerParams( url=url, timeout=30.0, sse_read_timeout=300.0, terminate_on_close=True, headers={"x-api-key": os.getenv("COMPOSIO_API_KEY")} ) ``` ### 6. Create the model client and agent What's happening: - OpenAIChatCompletionClient wraps the OpenAI model for Autogen - McpWorkbench connects the agent to the MCP tools - AssistantAgent is configured with the Mailcheck tools from the workbench ```python # Create model client model_client = OpenAIChatCompletionClient( model="gpt-5", api_key=os.getenv("OPENAI_API_KEY") ) # Use McpWorkbench as context manager async with McpWorkbench(server_params) as workbench: # Create Mailcheck assistant agent with MCP tools agent = AssistantAgent( name="mailcheck_assistant", description="An AI assistant that helps with Mailcheck operations.", model_client=model_client, workbench=workbench, model_client_stream=True, max_tool_iterations=10 ) ``` ### 7. Run the interactive chat loop What's happening: - The script prompts you in a loop with You: - Autogen passes your input to the model, which decides which Mailcheck tools to call via MCP - agent.run_stream(...) yields streaming messages as the agent thinks and calls tools - Typing exit, quit, or bye ends the loop ```python print("Chat started! Type 'exit' or 'quit' to end the conversation.\n") print("Ask any Mailcheck related question or task to the agent.\n") # Conversation loop while True: user_input = input("You: ").strip() if user_input.lower() in ["exit", "quit", "bye"]: print("\nGoodbye!") break if not user_input: continue print("\nAgent is thinking...\n") # Run the agent with streaming try: response_text = "" async for message in agent.run_stream(task=user_input): if hasattr(message, "content") and message.content: response_text = message.content # Print the final response if response_text: print(f"Agent: {response_text}\n") else: print("Agent: I encountered an issue processing your request.\n") except Exception as e: print(f"Agent: Sorry, I encountered an error: {str(e)}\n") ``` ## Complete Code ```python import asyncio import os from dotenv import load_dotenv from composio import Composio from autogen_agentchat.agents import AssistantAgent from autogen_ext.models.openai import OpenAIChatCompletionClient from autogen_ext.tools.mcp import McpWorkbench, StreamableHttpServerParams load_dotenv() async def main(): # Initialize Composio and create a Mailcheck session composio = Composio(api_key=os.getenv("COMPOSIO_API_KEY")) session = composio.create( user_id=os.getenv("USER_ID"), toolkits=["mailcheck"] ) url = session.mcp.url # Configure MCP server parameters for Streamable HTTP server_params = StreamableHttpServerParams( url=url, timeout=30.0, sse_read_timeout=300.0, terminate_on_close=True, headers={"x-api-key": os.getenv("COMPOSIO_API_KEY")} ) # Create model client model_client = OpenAIChatCompletionClient( model="gpt-5", api_key=os.getenv("OPENAI_API_KEY") ) # Use McpWorkbench as context manager async with McpWorkbench(server_params) as workbench: # Create Mailcheck assistant agent with MCP tools agent = AssistantAgent( name="mailcheck_assistant", description="An AI assistant that helps with Mailcheck operations.", model_client=model_client, workbench=workbench, model_client_stream=True, max_tool_iterations=10 ) print("Chat started! Type 'exit' or 'quit' to end the conversation.\n") print("Ask any Mailcheck related question or task to the agent.\n") # Conversation loop while True: user_input = input("You: ").strip() if user_input.lower() in ['exit', 'quit', 'bye']: print("\nGoodbye!") break if not user_input: continue print("\nAgent is thinking...\n") # Run the agent with streaming try: response_text = "" async for message in agent.run_stream(task=user_input): if hasattr(message, 'content') and message.content: response_text = message.content # Print the final response if response_text: print(f"Agent: {response_text}\n") else: print("Agent: I encountered an issue processing your request.\n") except Exception as e: print(f"Agent: Sorry, I encountered an error: {str(e)}\n") if __name__ == "__main__": asyncio.run(main()) ``` ## Conclusion You now have an Autogen assistant wired into Mailcheck through Composio's Tool Router and MCP. From here you can: - Add more toolkits to the toolkits list, for example notion or hubspot - Refine the agent description to point it at specific workflows - Wrap this script behind a UI, Slack bot, or internal tool Once the pattern is clear for Mailcheck, you can reuse the same structure for other MCP-enabled apps with minimal code changes. ## How to build Mailcheck MCP Agent with another framework - [OpenAI Agents SDK](https://composio.dev/toolkits/mailcheck/framework/open-ai-agents-sdk) - [Claude Agent SDK](https://composio.dev/toolkits/mailcheck/framework/claude-agents-sdk) - [Claude Code](https://composio.dev/toolkits/mailcheck/framework/claude-code) - [Claude Cowork](https://composio.dev/toolkits/mailcheck/framework/claude-cowork) - [Codex](https://composio.dev/toolkits/mailcheck/framework/codex) - [OpenClaw](https://composio.dev/toolkits/mailcheck/framework/openclaw) - [Hermes](https://composio.dev/toolkits/mailcheck/framework/hermes-agent) - [CLI](https://composio.dev/toolkits/mailcheck/framework/cli) - [Google ADK](https://composio.dev/toolkits/mailcheck/framework/google-adk) - [LangChain](https://composio.dev/toolkits/mailcheck/framework/langchain) - [Vercel AI SDK](https://composio.dev/toolkits/mailcheck/framework/ai-sdk) - [Mastra AI](https://composio.dev/toolkits/mailcheck/framework/mastra-ai) - [LlamaIndex](https://composio.dev/toolkits/mailcheck/framework/llama-index) - [CrewAI](https://composio.dev/toolkits/mailcheck/framework/crew-ai) ## Related Toolkits - [Aeroleads](https://composio.dev/toolkits/aeroleads) - Aeroleads is a B2B lead generation platform for finding business emails and phone numbers. Grow your sales pipeline faster with powerful prospecting tools. - [Autobound](https://composio.dev/toolkits/autobound) - Autobound is an AI-powered sales engagement platform that crafts hyper-personalized outreach and insights. It helps sales teams boost response rates and close more deals through tailored content and recommendations. - [Better proposals](https://composio.dev/toolkits/better_proposals) - Better Proposals is a web-based tool for crafting and sending professional proposals. It helps teams impress clients and close deals faster with slick, easy-to-use templates. - [Bidsketch](https://composio.dev/toolkits/bidsketch) - Bidsketch is a proposal software that helps businesses create professional proposals quickly and efficiently. It streamlines the proposal process, saving time while boosting client win rates. - [Bolna](https://composio.dev/toolkits/bolna) - Bolna is an AI platform for building conversational voice agents. It helps businesses automate support and streamline interactions through natural, voice-powered conversations. - [Botsonic](https://composio.dev/toolkits/botsonic) - Botsonic is a no-code AI chatbot builder for easily creating and deploying chatbots to your website. It empowers businesses to offer conversational experiences without writing code. - [Botstar](https://composio.dev/toolkits/botstar) - BotStar is a comprehensive chatbot platform for designing, developing, and training chatbots visually on Messenger and websites. It helps businesses automate conversations and customer interactions without coding. - [Callerapi](https://composio.dev/toolkits/callerapi) - CallerAPI is a white-label caller identification platform for branded caller ID and fraud prevention. It helps businesses boost customer trust while stopping spam, fraud, and robocalls. - [Callingly](https://composio.dev/toolkits/callingly) - Callingly is a lead response management platform that automates immediate call and text follow-ups with new leads. It helps sales teams boost response speed and close more deals by connecting seamlessly with CRMs and lead sources. - [Callpage](https://composio.dev/toolkits/callpage) - Callpage is a lead capture platform that lets businesses instantly connect with website visitors via callback. It boosts lead generation and increases your sales conversion rates. - [Clearout](https://composio.dev/toolkits/clearout) - Clearout is an AI-powered service for verifying, finding, and enriching email addresses. It boosts deliverability and helps you discover high-quality leads effortlessly. - [Clientary](https://composio.dev/toolkits/clientary) - Clientary is a platform for managing clients, invoices, projects, proposals, and more. It streamlines client work and saves you serious admin time. - [Convolo ai](https://composio.dev/toolkits/convolo_ai) - Convolo ai is an AI-powered communications platform for sales teams. It accelerates lead response and improves conversion rates by automating calls and integrating workflows. - [Delighted](https://composio.dev/toolkits/delighted) - Delighted is a customer feedback platform based on the Net Promoter System®. It helps you quickly gather, track, and act on customer sentiment. - [Docsbot ai](https://composio.dev/toolkits/docsbot_ai) - Docsbot ai is a platform that lets you build custom AI chatbots trained on your documentation. It automates customer support and content generation, saving time and improving response quality. - [Emelia](https://composio.dev/toolkits/emelia) - Emelia is an all-in-one B2B prospecting platform for cold-email, LinkedIn outreach, and prospect research. It streamlines outbound campaigns so you can find, engage, and warm up leads faster. - [Findymail](https://composio.dev/toolkits/findymail) - Findymail is a B2B data provider offering verified email and phone contacts for sales prospecting. Enhance outreach with automated exports, email verification, and CRM enrichment. - [Freshdesk](https://composio.dev/toolkits/freshdesk) - Freshdesk is customer support software with ticketing and automation tools. It helps teams streamline helpdesk operations for faster, better customer support. - [Fullenrich](https://composio.dev/toolkits/fullenrich) - FullEnrich is a B2B contact enrichment platform that aggregates emails and phone numbers from 15+ data vendors. Instantly find and verify lead contact data to boost your outreach. - [Gatherup](https://composio.dev/toolkits/gatherup) - GatherUp is a customer feedback and online review management platform. It helps businesses boost their reputation by streamlining how they collect and manage customer feedback. ## Frequently Asked Questions ### What are the differences in Tool Router MCP and Mailcheck MCP? With a standalone Mailcheck MCP server, the agents and LLMs can only access a fixed set of Mailcheck tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Mailcheck and many other apps based on the task at hand, all through a single MCP endpoint. ### Can I use Tool Router MCP with Autogen? Yes, you can. Autogen fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Mailcheck tools. ### Can I manage the permissions and scopes for Mailcheck while using Tool Router? Yes, absolutely. You can configure which Mailcheck scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do. ### How safe is my data with Composio Tool Router? All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Mailcheck data and credentials are handled as safely as possible. --- [See all toolkits](https://composio.dev/toolkits) · [Composio docs](https://docs.composio.dev/llms.txt)