How to Verify Email Addresses with Claude
Verify email addresses with Claude and ToolRouter. Check deliverability before sending.
Tool
Claude validates email addresses and explains the result — not just a pass/fail, but why an address is flagged as risky or disposable. Useful when you need to decide whether to pursue a lead or ask for an alternative address.
Connect ToolRouter to Claude
1Open connector settings Open Settings
2Add a custom connector with these details
Name
ToolRouterURL
https://api.toolrouter.com/mcp3Let Claude set you up Open Claude
Steps
Once connected (see setup above), use the Email Validator tool:
- Ask: "Validate this email address: example@domain.com"
- Claude returns the validation result with a deliverability verdict
- Ask: "Why is this address flagged as risky?"
- Use the result to decide whether to include the address in your send list
Example Prompt
Try this with Claude using the Email Validator tool
Validate this email address and tell me whether it is safe to send to: john.smith@company.com
Tips
- Ask Claude to explain the specific reason an address fails — DNS issue, invalid domain, or disposable service
- For leads, ask whether the domain is a business domain or a consumer email service
- Validate before adding to your CRM, not after a bounce has already occurred