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How to connect Kickbox to Claude

Connect Claude Web, Desktop and Cowork to Kickbox MCP. Check if this email is valid, verify deliverability of a customer email, and more using natural language, with authentication handled for you.

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Kickbox is a real-time email verification and list cleaning service. It helps ensure your emails reach real, active inboxes and improves deliverability.

2 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 Kickbox account to Claude via Composio Connect, enabling it to check if this email is valid, verify deliverability of a customer email, validate new sign-up email address, 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 Kickbox with

Claude CodeOpenAI Agents SDKClaude Agent SDKCodexOpenClawHermesAtomic AgentGoogle ADKLangChainVercel AI SDKMastra AILlamaIndexCrewAIPydantic AIAutoGen

Connecting Kickbox to Claude Web, Desktop, and Cowork

Two ways to add the Composio connector. Pick whichever you prefer.

1. Add with one click

Click the button. Claude opens with the Composio connector filled in. Click Add, then go to step 2.

Add to Claude

Add manually

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

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

2. 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

3. Connect your Kickbox account

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

For example, ask Claude to:

  • "Check if this email is valid"
  • "Verify deliverability of a customer email"
  • "Validate new sign-up email address"

It will prompt you to authenticate and authorize access.

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

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

The Kickbox MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Kickbox account. It provides structured and secure access to real-time email verification and quality scoring, so your agent can instantly validate email addresses, reduce bounce rates, and maintain clean contact lists on your behalf.

  • Instant single email verification: Ask your agent to check if an email address is valid and deliverable before sending important communications.
  • Preventing invalid email submissions: Ensure only legitimate and active emails are accepted into your systems, reducing bounce risk and protecting sender reputation.
  • Real-time workflow integration: Validate emails as part of onboarding, registration, or transactional processes to catch errors and typos immediately.
  • Email quality scoring: Assess the likelihood of deliverability and filter out risky or low-quality addresses from your lists.
  • Automated contact list hygiene: Regularly verify individual emails to keep your CRM and marketing lists accurate and up to date.

Troubleshooting

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

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

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

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

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

  • 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 Kickbox.
  • If it fails again, send the error and the ofid_ reference id to support@composio.dev.

3. Why does the Kickbox authorization link not work?

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

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

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

The Kickbox connection can expire or lose permission.

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

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

Claude can manage the Kickbox connection for you.

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

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

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

  • In Claude Desktop, open Customize > Connectors.
  • Next to Composio, click ⋮ and click Clear cache.
  • If Kickbox 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 Kickbox.
TOOLS

Supported Tools

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

Check Disposable Email

Tool to check if an email address or domain is from a disposable email service.

Kickbox Single Verification

Tool to verify a single email address via Kickbox.

FRAMEWORKS

How to build Kickbox MCP Agent with another framework

Claude Code logo

Claude Code

Use Kickbox MCP with Claude Code

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Kickbox MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Kickbox MCP with Claude Agent SDK

Codex logo

Codex

Use Kickbox MCP with Codex

OpenClaw logo

OpenClaw

Use Kickbox MCP with OpenClaw

Hermes logo

Hermes

Use Kickbox MCP with Hermes

Atomic Agent logo

Atomic Agent

Use Kickbox MCP with Atomic Agent

Google ADK logo

Google ADK

Use Kickbox MCP with Google ADK

LangChain logo

LangChain

Use Kickbox MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Kickbox MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Kickbox MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Kickbox MCP with LlamaIndex

CrewAI logo

CrewAI

Use Kickbox MCP with CrewAI

Pydantic AI logo

Pydantic AI

Use Kickbox MCP with Pydantic AI

AutoGen logo

AutoGen

Use Kickbox MCP with AutoGen

FAQ

Frequently asked questions

With a standalone Kickbox MCP server, the agents and LLMs can only access a fixed set of Kickbox tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Kickbox 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 Kickbox tools.

Yes, absolutely. You can configure which Kickbox 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 Kickbox data and credentials are handled as safely as possible.

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