Bulk Validate an Email List
Clean an entire contact list by checking every address for validity, deliverability, and spam traps in one pass.
Verify Email Address Deliverability
Check whether a single email address is real, active, and safe to send to before using it.
Tool
Sending to an email address you are not sure about — a lead from a form, an address from a business card, or a contact from a third-party list — risks a bounce that damages your sender reputation. Once your domain starts accumulating bounces, deliverability drops across your entire sending list, not just the bad address.
The validate_email skill checks an email address against DNS records, SMTP server responses, and known disposable address databases to determine whether it is real and deliverable. You get a verdict — valid, invalid, disposable, or risky — before you send anything.
Sales teams qualifying inbound leads, recruiters verifying candidate contact details, and email marketers checking new subscribers all use this to catch bad addresses before they affect sending reputation.
Agent Guides
Claude
- Connect ToolRouter to Claude: claude mcp add toolrouter -- npx -y toolrouter-mcp
- Ask: "Validate this email address: example@domain.com"
- Claude returns the validation result with a deliverability verdict
ChatGPT
- Add ToolRouter to ChatGPT using the MCP JSON configuration
- Ask: "Check if this email is valid: example@domain.com"
- ChatGPT returns the validation status and any risk flags
Copilot
- Add ToolRouter to your Copilot MCP configuration
- In Copilot Chat: "Validate this email address: test@example.com"
- Copilot returns the validation result
OpenClaw
- Connect ToolRouter to OpenClaw: openclaw mcp add toolrouter -- npx -y toolrouter-mcp
- Provide a list of addresses: "Validate each of these email addresses"
- OpenClaw checks each and returns a verdict for every address
Related Use Cases