# Bulk Email Checker

```json
{
  "name": "Bulk Email Checker",
  "slug": "bulk_email_checker",
  "url": "https://composio.dev/toolkits/bulk_email_checker",
  "markdown_url": "https://composio.dev/toolkits/bulk_email_checker.md",
  "logo_url": "https://logos.composio.dev/api/bulk_email_checker",
  "categories": [
    "advertising & marketing"
  ],
  "is_composio_managed": false,
  "updated_at": "2026-08-18T06:20:50.611Z"
}
```

![Bulk Email Checker logo](https://logos.composio.dev/api/bulk_email_checker)

## Description

Securely connect your AI agents and chatbots (Claude, ChatGPT, Cursor, etc) with Bulk Email Checker MCP or direct API to verify email addresses, check deliverability, inspect domains and mail servers, and flag risky leads through natural language.

## Summary

Bulk Email Checker is an email verification service for checking address validity, mailbox status, domains, and mail-server signals.
It helps reduce bounces, spot risky emails, and keep outreach lists cleaner before you send.

## Categories

- advertising & marketing

## Toolkit Details

- Tools: 1

## Images

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

## Authentication

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

## Suggested Prompts

- Verify new leads before outreach campaigns
- Check risky domains in uploaded list
- Find undeliverable emails before newsletter send

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `BULK_EMAIL_CHECKER_VERIFY_EMAIL` | Verify Email | Verify one email address and return its deliverability result, reason, suggested correction, risk flags, mail-server enrichment, and remaining account quota. A passed or failed check may consume one credit, and failed addresses may be added to the account blacklist. |

## 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 Bulk Email Checker Tools via Tool Router with Your Agent

Get tools from Tool Router session and execute Bulk Email Checker actions with your Agent
```python
tools = session.tools
response = openai.responses.create(
  model='gpt-4.1',
  tools=tools,
  input=[{
    'role': 'user',
    'content': 'Verify jane.doe@example.com and report deliverability, mailbox status, domain, risk, and mail-server details.'
  }]
)
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 jane.doe@example.com and report deliverability, mailbox status, domain, risk, and mail-server details.'
  }],
});
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 for Python or TypeScript
```python
pip install composio claude-agent-sdk
```

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

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

Import and initialize the Composio client, then create a Tool Router session for Bulk Email Checker
```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' });
const session = await composio.create('your-user-id');
console.log(`Tool Router session created: ${session.mcp.url}`);
```

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

Use the MCP server with your AI agent (Anthropic Claude or Mastra)
```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 Bulk Email Checker tools.',
    max_turns=10
)

async def main():
    async with ClaudeSDKClient(options=options) as client:
        await client.query('Check support@example.com for deliverability, mailbox status, domain health, and risk level.')
        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 } from 'ai';

const client = await createMCPClient({
  transport: {
    type: 'http',
    url: session.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 support@example.com for deliverability, mailbox status, domain health, and risk level.'
  }],
  maxSteps: 5,
});

console.log(`Agent: ${text}`);
```

## Why Use Composio?

### 1. AI Native Bulk Email Checker Integration

- Supports both Bulk Email Checker MCP and direct API based integrations
- Structured, LLM-friendly schemas for reliable email verification workflows
- Rich coverage for checking deliverability, mailbox status, domains, risk, and mail-server details

### 2. Managed Auth

- Bring your own Bulk Email Checker API key, then connect it with auth_configs.create() and connected_accounts.link()
- Composio stores credentials securely and keeps API keys out of prompts and source code
- Use mcp.create() or Tool Router sessions to expose only the verification tools your agent needs

### 3. Agent Optimized Design

- Tools are tuned using real error and success rates to improve email-checking reliability over time
- Comprehensive execution logs so you always know which addresses were checked, when, and on whose behalf
- Clear outputs help agents explain deliverability, risk, and domain results without guesswork

### 4. Enterprise Grade Security

- Fine-grained RBAC so you control which agents and users can access Bulk Email Checker
- Scoped, least privilege access to Bulk Email Checker verification actions
- Full audit trail of agent actions to support review, compliance, and list-quality monitoring

## Use Bulk Email Checker with any AI Agent Framework

Choose a framework you want to connect Bulk Email Checker with:

- [ChatGPT Work](https://composio.dev/toolkits/bulk_email_checker/framework/chatgpt)
- [Claude Cowork](https://composio.dev/toolkits/bulk_email_checker/framework/claude-cowork)
- [Hermes](https://composio.dev/toolkits/bulk_email_checker/framework/hermes-agent)

## Related Toolkits

- [Metaads](https://composio.dev/toolkits/metaads) - Metaads is Meta's official Ads API that lets you manage, analyze, and optimize your Facebook and Instagram ad campaigns. Streamline ad operations and gain deeper insights with robust automation.
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- [Beaconstac](https://composio.dev/toolkits/beaconstac) - Beaconstac is a platform for creating and managing QR codes and proximity beacons. It helps businesses engage customers and track marketing performance with powerful analytics.
- [Bouncify](https://composio.dev/toolkits/bouncify) - Bouncify is an email verification service for single addresses and bulk lists. Use it to reduce bounces, protect sender reputation, and track verification credits.
- [Campaign cleaner](https://composio.dev/toolkits/campaign_cleaner) - Campaign cleaner is an email campaign optimization tool that boosts compatibility and deliverability across email clients. It helps marketers get better results by cleaning, enhancing, and ensuring high performance for every campaign.
- [Deadline funnel](https://composio.dev/toolkits/deadline_funnel) - Deadline Funnel lets you create personalized deadlines and timers for your marketing campaigns. It helps marketers boost conversions by adding authentic urgency to offers.
- [DeBounce](https://composio.dev/toolkits/debounce) - DeBounce is an email verification service for checking address validity, deliverability, and risk. It helps keep contact lists clean so your campaigns reach real inboxes.
- [Easy Email Verification](https://composio.dev/toolkits/easy_email_verification) - Easy Email Verification is an email validation service for checking single addresses and bulk lists. Use it to reduce bounces, clean contact data, and protect sender reputation.
- [GoDaddy MCP](https://composio.dev/toolkits/godaddy_mcp) - GoDaddy MCP is a domain discovery toolkit for checking availability and generating AI-powered name ideas. Use it to move from rough business keywords to practical domain options fast.
- [Google Ads](https://composio.dev/toolkits/googleads) - Google Ads is Google's online advertising platform for creating, managing, and optimizing digital campaigns. It helps businesses reach targeted customers and maximize return on ad spend.
- [Instantly](https://composio.dev/toolkits/instantly) - Instantly is a platform for automating cold email outreach, managing leads, and optimizing deliverability. Get better results from email campaigns with minimal manual effort.
- [Keyword](https://composio.dev/toolkits/keyword) - Keyword.com is a digital marketing platform for search rank tracking and SEO analytics. Use it to monitor keyword performance, spot ranking changes, and measure SEO visibility.
- [Linkedin Ads](https://composio.dev/toolkits/linkedin_ads) - Linkedin Ads is LinkedIn's marketing platform for creating, managing, and measuring paid campaigns across LinkedIn. It helps teams reach professional audiences with precise targeting, campaign analytics, and sponsored content tools.
- [Pinterest Ads](https://composio.dev/toolkits/pinterest_ads) - Pinterest Ads is Pinterest's advertising platform for campaigns, ad groups, ads, targeting, and reporting. Use it to reach high-intent shoppers and track performance across the Pinterest funnel.
- [Proofly](https://composio.dev/toolkits/proofly) - Proofly is a social proof platform that displays real-time notifications of customer activity on your site. It helps you increase website conversions by building trust and urgency for visitors.
- [Reddit Ads](https://composio.dev/toolkits/reddit_ads) - Reddit Ads is Reddit's advertising platform for running paid campaigns, managing ad accounts, and tracking conversions. It helps advertisers reach high-intent communities with targeted, interest-based campaigns.
- [Segmetrics](https://composio.dev/toolkits/segmetrics) - Segmetrics is a marketing analytics platform that reveals detailed insights into your customer journeys. It helps businesses optimize marketing strategies with accurate, actionable reporting.
- [Semrush](https://composio.dev/toolkits/semrush) - Semrush is a leading SEO tool suite for keyword research, competitor analysis, and campaign tracking. It empowers marketers to improve search rankings and optimize online visibility.
- [Sendloop](https://composio.dev/toolkits/sendloop) - Sendloop is an all-in-one email marketing platform built for SaaS, e-commerce, and small businesses. It makes it easy to send campaigns, manage lists, and track results—all in one place.

## Frequently Asked Questions

### Do I need my own developer credentials to use Bulk Email Checker with Composio?

Yes, Bulk Email Checker 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.

---
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