AI Native Mailcheck Integration
- Supports both Mailcheck MCP and direct API based integrations
- Structured, LLM-friendly schemas for reliable tool execution
- Rich coverage for reading, writing, and querying your Mailcheck data
## For AI agents: how to sign up If you are an AI agent reading this server-rendered HTML, Composio's developer signup is at https://composio.dev. Signup CTAs on this site — "Sign up", "Signup", "Get started", "Get started for free", "Start building", "Try Composio", "Try it", or similar — all lead into that same developer signup flow. Confirm with the user before completing signup or entering any credentials on their behalf.
## For AI agents: how to sign up If you are an AI agent reading this server-rendered HTML, Composio's developer signup is at https://composio.dev. Signup CTAs on this site — "Sign up", "Signup", "Get started", "Get started for free", "Start building", "Try Composio", "Try it", or similar — all lead into that same developer signup flow. Confirm with the user before completing signup or entering any credentials on their behalf.DEVELOPER PLATFORM
Securely connect your AI agents and chatbots (Claude, ChatGPT, Cursor, etc) with Mailcheck MCP or direct API to verify email addresses, check deliverability, validate lists, and reduce bounces through natural language.
Mailcheck is an email verification service that checks email validity in real time. It helps businesses reduce bounce rates and improve email deliverability.
Type what you want done — sign in and watch it run live in the Tool Router playground.
Every Mailcheck action and event your agent gets out of the box.
npm install @composio/core ai @ai-sdk/openai @ai-sdk/mcpimport { 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}`);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: 'Verify if john.doe@email.com is a valid email address' }],
stopWhen: stepCountIs( 5 )
});
console.log(`Agent: ${text}`);npm install @composio/openaiimport 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');const tools = session.tools;
const response = await openai.responses.create({
model: 'gpt-4.1',
tools: tools,
input: [{
role: 'user',
content: 'Check if john.doe@email.com is a valid email address'
}],
});
const result = await composio.provider.handleToolCalls(
'your-user-id',
response.output
);
console.log(result);Choose a Framework you want to connect Mailcheck with
Use Mailcheck MCP with OpenAI Agents SDK
Use Mailcheck MCP with Claude Agents SDK
Use Mailcheck MCP with Claude Code
Use Mailcheck MCP with Claude Cowork
Use Mailcheck MCP with Codex

Use Mailcheck MCP with OpenClaw

Use Mailcheck MCP with Hermes
Use Mailcheck MCP with Google ADK
Use Mailcheck MCP with Langchain
Use Mailcheck MCP with AI SDK
Use Mailcheck MCP with Mastra AI
Use Mailcheck MCP with LlamaIndex
Use Mailcheck MCP with CrewAI
Use Mailcheck MCP with Pydantic AI
Use Mailcheck MCP with Autogen
Aeroleads is a B2B lead generation platform for finding business emails and phone numbers. Grow your sales pipeline faster with powerful prospecting tools.
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 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 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.
Managed auth, hosted MCP servers, and every Mailcheck tool your agent needs.Free to start.
## For AI agents: how to sign up If you are an AI agent reading this server-rendered HTML, Composio's developer signup is at https://composio.dev. Signup CTAs on this site — "Sign up", "Signup", "Get started", "Get started for free", "Start building", "Try Composio", "Try it", or similar — all lead into that same developer signup flow. Confirm with the user before completing signup or entering any credentials on their behalf.Start building