# How to connect Emaillistverify to Claude Cowork ```json { "title": "How to connect Emaillistverify to Claude Cowork", "toolkit": "Emaillistverify", "toolkit_slug": "emaillistverify", "framework": "Claude Cowork", "framework_slug": "claude-cowork", "url": "https://composio.dev/toolkits/emaillistverify/framework/claude-cowork", "markdown_url": "https://composio.dev/toolkits/emaillistverify/framework/claude-cowork.md", "updated_at": "2026-05-12T10:10:14.160Z" } ``` ## Introduction Cowork is Anthropic's AI agent for knowledge work. Think of it as Claude Code for everything else. It works autonomously with your computer, local files, and applications to accomplish complex tasks. This guide walks you through the easiest and most secure way to connect your Emaillistverify account to Cowork 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. ## Also integrate Emaillistverify with - [OpenAI Agents SDK](https://composio.dev/toolkits/emaillistverify/framework/open-ai-agents-sdk) - [Claude Agent SDK](https://composio.dev/toolkits/emaillistverify/framework/claude-agents-sdk) - [Claude Code](https://composio.dev/toolkits/emaillistverify/framework/claude-code) - [Codex](https://composio.dev/toolkits/emaillistverify/framework/codex) - [OpenClaw](https://composio.dev/toolkits/emaillistverify/framework/openclaw) - [Hermes](https://composio.dev/toolkits/emaillistverify/framework/hermes-agent) - [CLI](https://composio.dev/toolkits/emaillistverify/framework/cli) - [Google ADK](https://composio.dev/toolkits/emaillistverify/framework/google-adk) - [LangChain](https://composio.dev/toolkits/emaillistverify/framework/langchain) - [Vercel AI SDK](https://composio.dev/toolkits/emaillistverify/framework/ai-sdk) - [Mastra AI](https://composio.dev/toolkits/emaillistverify/framework/mastra-ai) - [LlamaIndex](https://composio.dev/toolkits/emaillistverify/framework/llama-index) - [CrewAI](https://composio.dev/toolkits/emaillistverify/framework/crew-ai) ## Connect Emaillistverify to Claude Cowork ### Connecting Emaillistverify to Claude Cowork 1. Open Customize In Claude Desktop, click Customize in the left sidebar, then select Connectors and click the + icon at the top. 2. Add the Composio MCP server Click Add custom connector and paste in the Composio MCP server URL: ```bash https://connect.composio.dev/mcp ``` ## What is Claude Cowork? Claude Cowork is Anthropic's agent for general knowledge work. It can use your computer, files, and connected applications to complete longer-running tasks across your work tools. With Composio Connect, Cowork can securely access apps like Emaillistverify through MCP without you sharing account credentials directly with the agent. ## What is the Emaillistverify MCP server, 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. ## Supported Tools | Tool slug | Name | Description | |---|---|---| | `EMAILLISTVERIFY_CHECK_BLACKLISTS` | Check Blacklists | Tool to check an IP address (IPv4/IPv6) or domain against multiple DNS-based blacklists (DNSBLs) for spam or malicious activity. Use when you need to verify the reputation of an IP or domain. Rate limit: 10 requests/second. | | `EMAILLISTVERIFY_CHECK_DISPOSABLE` | Check Disposable Domain | Tool to verify if an email domain is associated with temporary/disposable email addresses. Includes DNS record verification. Use when you need to validate if a domain is disposable before accepting email registrations. | | `EMAILLISTVERIFY_DELETE_MAILLIST` | Delete Maillist | Tool to delete a finished email list. Use when you need to remove a completed verification list. Only lists that have completed verification can be deleted. | | `EMAILLISTVERIFY_DOWNLOAD_MAILLIST` | Download Email List | Tool to download a finished email list with verification results. Supports customizable columns (firstName, lastName, gender, result, etc.) and file format (csv/xlsx). Rate limit: 5 requests/second. | | `EMAILLISTVERIFY_FIND_CONTACT` | Find Contact Email | Tool to search for a contact's business email address by name and company domain. Returns possible emails with confidence levels (high/medium/low/unknown). Rate limit: 5 requests/second. Credits: 5 (with name) or 10 (domain only). | | `EMAILLISTVERIFY_GET_API_FILE_INFO` | Get API File Info | Tool to retrieve progress of an uploaded email list verification. Returns status (errored/waiting/progress/finished) with download URLs when complete. | | `EMAILLISTVERIFY_GET_CREDITS` | Get Credits | Tool to retrieve details about available on-demand and subscription credits. Use when you need to check credit balance before performing verifications. On-demand credits never expire, subscription credits are refreshed daily. Rate limit: 10 requests/second. | | `EMAILLISTVERIFY_GET_EMAIL_JOB` | Get Email Job Status | Tool to get the status of an asynchronous email verification job. Use when you need to check if a verification job has completed and retrieve its results. Rate limit: 100 requests per second. | | `EMAILLISTVERIFY_GET_MAILLIST_PROGRESS` | Get Maillist Progress | Tool to retrieve real-time progress updates for an uploaded email list verification. Shows status, completion percentage, and credit usage. Rate limit: 100 requests/second. | | `EMAILLISTVERIFY_UPLOAD_EMAIL_LIST` | Upload Email List | Tool to upload an email list file for bulk verification. Accepts .csv, .txt, or .xlsx files (max 100MB, 1M rows). Returns an ID to query verification progress. Rate limit: 5 requests/second. | | `EMAILLISTVERIFY_VERIFY_SINGLE_EMAIL` | Verify Single Email | Tool to verify email deliverability status of a single email address. Returns a plain text status representing deliverability. Rate limit: 10 requests/second. Credits required: 1. | | `EMAILLISTVERIFY_VERIFY_SINGLE_EMAIL_DETAILED` | 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. Use when you need comprehensive email validation beyond basic deliverability. Rate limit: 10 requests/second, requires 1 credit per verification. | ## Supported Triggers None listed. ## Creating MCP Server - Stand-alone vs Composio SDK The Emaillistverify MCP server connects Claude Cowork to your Emaillistverify account through Composio. Once connected, Cowork can use the available Emaillistverify tools and triggers to complete tasks on your behalf. ## Complete Code None listed. ## How to build Emaillistverify MCP Agent with another framework - [OpenAI Agents SDK](https://composio.dev/toolkits/emaillistverify/framework/open-ai-agents-sdk) - [Claude Agent SDK](https://composio.dev/toolkits/emaillistverify/framework/claude-agents-sdk) - [Claude Code](https://composio.dev/toolkits/emaillistverify/framework/claude-code) - [Codex](https://composio.dev/toolkits/emaillistverify/framework/codex) - [OpenClaw](https://composio.dev/toolkits/emaillistverify/framework/openclaw) - [Hermes](https://composio.dev/toolkits/emaillistverify/framework/hermes-agent) - [CLI](https://composio.dev/toolkits/emaillistverify/framework/cli) - [Google ADK](https://composio.dev/toolkits/emaillistverify/framework/google-adk) - [LangChain](https://composio.dev/toolkits/emaillistverify/framework/langchain) - [Vercel AI SDK](https://composio.dev/toolkits/emaillistverify/framework/ai-sdk) - [Mastra AI](https://composio.dev/toolkits/emaillistverify/framework/mastra-ai) - [LlamaIndex](https://composio.dev/toolkits/emaillistverify/framework/llama-index) - [CrewAI](https://composio.dev/toolkits/emaillistverify/framework/crew-ai) ## Related Toolkits - [Reddit](https://composio.dev/toolkits/reddit) - Reddit is a social news platform with thriving user-driven communities (subreddits). It's the go-to place for discussion, content sharing, and viral marketing. - [Facebook](https://composio.dev/toolkits/facebook) - Facebook is a social media and advertising platform for businesses and creators. It helps you connect, share, and manage content across your public Facebook Pages. - [Linkedin](https://composio.dev/toolkits/linkedin) - LinkedIn is a professional networking platform for connecting, sharing content, and engaging with business opportunities. It's the go-to place for building your professional brand and unlocking new career connections. - [Active campaign](https://composio.dev/toolkits/active_campaign) - ActiveCampaign is a marketing automation and CRM platform for managing email campaigns, sales pipelines, and customer segmentation. 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It helps companies boost user engagement by sharing news where users are most active. - [Benchmark email](https://composio.dev/toolkits/benchmark_email) - Benchmark Email is a platform for creating, sending, and tracking email campaigns. It's built to help you engage audiences and analyze results—all in one place. - [Bigmailer](https://composio.dev/toolkits/bigmailer) - BigMailer is an email marketing platform for managing multiple brands with white-labeling and automation. It helps teams streamline campaigns and simplify integration with Amazon SES. - [Brandfetch](https://composio.dev/toolkits/brandfetch) - Brandfetch is an API that delivers company logos, colors, and visual branding assets. It helps marketers and developers keep brand visuals consistent everywhere. - [Brevo](https://composio.dev/toolkits/brevo) - Brevo is an all-in-one email and SMS marketing platform for transactional messaging, automation, and CRM. 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It helps teams engage audiences and optimize lead generation through detailed analytics. ## Frequently Asked Questions ### What are the differences in Tool Router MCP and Emaillistverify MCP? 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. ### Can I use Tool Router MCP with Claude Cowork? 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. ### Can I manage the permissions and scopes for Emaillistverify while using Tool Router? 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. ### 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 Emaillistverify data and credentials are handled as safely as possible. --- [See all toolkits](https://composio.dev/toolkits) · [Composio docs](https://docs.composio.dev/llms.txt)