How to connect MailerCheck to Claude Cowork

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 MailerCheck account to Cowork via Composio Connect, enabling it to verify new signup email addresses, check MailerCheck account credit balance, review latest list verification results, and more such actions on your behalf without compromising your account security.

Connecting MailerCheck 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:

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 MailerCheck through MCP without you sharing account credentials directly with the agent.

The MailerCheck MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your MailerCheck account. It provides structured and secure access to email verification, verification lists, results, and account details, so your agent can verify individual addresses, create and run list checks, review results, manage lists, and monitor verification credits on your behalf.

• Individual email verification: Have your agent verify a specific email address before you add it to a campaign or contact database.
• Bulk list verification: Let the agent create a named list of email addresses and start checking every address in it.
• Verification status and results: Direct your agent to review a list's progress, summary statistics, and email-level results, including results filtered by classification.
• Verification list management: Instruct your agent to browse existing verification lists, inspect a chosen list, or permanently delete one you no longer need.
• Account and credit checks: Have your agent confirm the connected MailerCheck account and report the current verification-credit balance.