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How to connect Emaillistverify to Claude

Connect Claude Web, Desktop and Cowork to Emaillistverify MCP. Check if this email address is valid, get detailed deliverability info for an email, and more using natural language, with authentication handled for you.

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EmailListVerify is a platform for verifying and validating email addresses in bulk. It helps ensure your contact lists are accurate, reducing bounces and improving deliverability.

12 Tools

Introduction

Claude is Anthropic's AI assistant, available on the web, in the desktop app, and on mobile. Cowork is its agent for knowledge work, and it runs on all of those surfaces too. Connected to your apps, Claude can work with your files and services to accomplish complex tasks on your behalf.

This guide walks you through the easiest and most secure way to connect your Emaillistverify account to Claude via Composio Connect, enabling it to check if this email address is valid, get detailed deliverability info for an email, verify a user's email before signup, and more such actions on your behalf without compromising your account security.

Setup is the same on Claude Web, Desktop, and Cowork, and you only need to do it once. The connector is tied to your account, so it's available in all three.

Also integrate Emaillistverify with

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Connecting Emaillistverify to Claude Web, Desktop, and Cowork

1. Open Customize

In Claude Desktop, click Customize in the left sidebar, then select Connectors and click the + icon at the top.

Claude Desktop connectors screen with Add custom connector selected

2. Add the Composio MCP server

Click Add custom connector and paste in the Composio MCP server URL:

bash
https://connect.composio.dev/mcp
Add custom connector dialog with Composio MCP server URL

3. Authorize in your browser

Click Connect. You'll be redirected to a browser window where you can authorize Composio to continue.

Composio authorization screen for Claude Web, Desktop, and Cowork

4. Connect your Emaillistverify account

Back in Claude, ask it to connect to Emaillistverify or give it any Emaillistverify-related task.

For example, ask Claude to:

  • "Check if this email address is valid"
  • "Get detailed deliverability info for an email"
  • "Verify a user's email before signup"

It will prompt you to authenticate and authorize access.

That's it. Composio's tools are now available in Claude, and your Emaillistverify account is ready to use.

What is the Emaillistverify Claude Connector, and what's possible with it?

The Emaillistverify MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Emaillistverify account. It provides structured and secure access to your email verification tools, so your agent can validate addresses, check deliverability, and provide detailed insights into email list quality on your behalf.

  • Real-time email verification: Instantly check if a single email address is valid and deliverable before adding it to your list or sending messages.
  • Detailed email validation insights: Get in-depth reports on why an email address may be risky or undeliverable, including error types and validation reasons.
  • Automated list hygiene: Quickly verify new signups or leads as they come in, helping you keep your email lists clean and up-to-date.
  • Prevent bounced emails: Reduce hard bounces and protect your sender reputation by validating addresses before campaigns are sent.

Troubleshooting

1. Why does Claude not use the Composio connector for Emaillistverify?

The connector can show as connected, but Claude must use it in each Emaillistverify conversation.

  • Click + at the lower left of the chat, or type /.
  • Hover Connectors.
  • Turn on Composio.
  • Ask Claude to connect to Emaillistverify again.

2. Why does Claude show an MCP server error before Emaillistverify connects?

Claude can show Couldn't reach the MCP server or Authorization with the MCP server failed when you add the connector for Emaillistverify.

  • Check that the connector URL is https://connect.composio.dev/mcp.
  • Connectors run from Anthropic's cloud, so your device network is usually not the problem.
  • Add the connector again from Customize > Connectors, then ask Claude to connect Emaillistverify.
  • If it fails again, send the error and the ofid_ reference id to support@composio.dev.

3. Why does the Emaillistverify authorization link not work?

The Composio connector is one server. Your Emaillistverify account connects separately when Claude asks for it.

  • If the browser does not open, or the link expires, ask Claude to retry the Emaillistverify connection.
  • Composio creates a fresh Emaillistverify authorization link.
  • Open that link in your browser and finish the Emaillistverify sign-in.

4. Why do Emaillistverify actions fail after they worked before?

The Emaillistverify connection can expire or lose permission.

  • Ask Claude to inspect the Emaillistverify connection.
  • If the connection is unhealthy, disconnect it when Claude prompts you.
  • Reconnect the Emaillistverify account and retry the action.
  • If Claude shows a permission prompt, approve it before Claude changes data in Emaillistverify.
  • If the action still fails with a permission error, check that the connected account has that permission in Emaillistverify itself.

5. How do I switch to a different Emaillistverify account?

Claude can manage the Emaillistverify connection for you.

  • Ask Claude to disconnect or delete the current Emaillistverify account.
  • Ask Claude to connect Emaillistverify again.
  • Open the new Composio authorization link for Emaillistverify.
  • Sign in with the other Emaillistverify account in the browser.
  • After the account connects, ask Claude to retry the Emaillistverify task.

6. Why is my Emaillistverify connection missing in Claude Desktop or on a Team plan?

The connector belongs to your Claude account, so your Emaillistverify connection works in Claude Web, Desktop, and Cowork.

  • In Claude Desktop, open Customize > Connectors.
  • Next to Composio, click ⋮ and click Clear cache.
  • If Emaillistverify tools still do not appear, click ⋮, disconnect, remove the connector, and add it again.
  • On Team or Enterprise, an Owner or Primary Owner must enable the connector before you can connect Emaillistverify.
TOOLS

Supported Tools

Every Emaillistverify action and event your agent gets out of the box.

Check Blacklists

Tool to check an IP address (IPv4/IPv6) or domain against multiple DNS-based blacklists (DNSBLs) for spam or malicious activity.

Check Disposable Domain

Tool to verify if an email domain is associated with temporary/disposable email addresses.

Delete Maillist

Tool to delete a finished email list.

Download Email List

Tool to download a finished email list with verification results.

Find Contact Email

Tool to search for a contact's business email address by name and company domain.

Get API File Info

Tool to retrieve progress of an uploaded email list verification.

Get Credits

Tool to retrieve details about available on-demand and subscription credits.

Get Email Job Status

Tool to get the status of an asynchronous email verification job.

Get Maillist Progress

Tool to retrieve real-time progress updates for an uploaded email list verification.

Upload Email List

Tool to upload an email list file for bulk verification.

Verify Single Email

Tool to verify email deliverability status of a single email address.

Verify Single Email Detailed

Tool to verify email deliverability with detailed metadata including MX server info, ESP, first/last name estimation, gender, and role detection.

FRAMEWORKS

How to build Emaillistverify MCP Agent with another framework

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Emaillistverify MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Emaillistverify MCP with Claude Agent SDK

Claude Code logo

Claude Code

Use Emaillistverify MCP with Claude Code

Codex logo

Codex

Use Emaillistverify MCP with Codex

OpenClaw logo

OpenClaw

Use Emaillistverify MCP with OpenClaw

Hermes logo

Hermes

Use Emaillistverify MCP with Hermes

Google ADK logo

Google ADK

Use Emaillistverify MCP with Google ADK

LangChain logo

LangChain

Use Emaillistverify MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Emaillistverify MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Emaillistverify MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Emaillistverify MCP with LlamaIndex

CrewAI logo

CrewAI

Use Emaillistverify MCP with CrewAI

Pydantic AI logo

Pydantic AI

Use Emaillistverify MCP with Pydantic AI

AutoGen logo

AutoGen

Use Emaillistverify MCP with AutoGen

FAQ

Frequently asked questions

With a standalone Emaillistverify MCP server, the agents and LLMs can only access a fixed set of Emaillistverify tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Emaillistverify and many other apps based on the task at hand, all through a single MCP endpoint.

Yes, you can. Claude Cowork 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 Emaillistverify tools.

Yes, absolutely. You can configure which Emaillistverify 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.

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 Emaillistverify data and credentials are handled as safely as possible.

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