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.
Quick answer: Use the Email Validator tool through ToolRouter to verify email address deliverability directly from Claude, ChatGPT, Microsoft Copilot, and OpenClaw — connect once, then drive it with plain-language prompts. No code required.
ToolSending 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.
How to verify email address deliverability with Claude, ChatGPT, Microsoft Copilot, and OpenClaw
Connect ToolRouter
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
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.
How to verify email address deliverability
Once connected (see setup above), use the Email Validator tool — the same steps work with Claude, ChatGPT, Microsoft Copilot, OpenClaw, and any MCP client:
- 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 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
Frequently Asked Questions
How do I verify email address deliverability with an AI assistant?
Check whether a single email address is real, active, and safe to send to before using it. Connect the Email Validator tool to Claude, ChatGPT, Microsoft Copilot, and OpenClaw through ToolRouter, then ask the assistant in plain language. For example: Ask: "Validate this email address: example@domain.com" Claude returns the validation result with a deliverability verdict
Which AI assistants can verify email address deliverability?
Claude, ChatGPT, Microsoft Copilot, and OpenClaw can all verify email address deliverability using the Email Validator tool through ToolRouter, with no API keys or coding required.
What does the Email Validator tool do?
Verify email addresses are real, deliverable, and not disposable or spam traps.
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