Verify Email Address Deliverability
Check whether a single email address is real, active, and safe to send to before using it.
Bulk Validate an Email List
Clean an entire contact list by checking every address for validity, deliverability, and spam traps in one pass.
Quick answer: Use the Email Validator tool through ToolRouter to bulk validate an email list directly from Claude, ChatGPT, Microsoft Copilot, and OpenClaw — connect once, then drive it with plain-language prompts. No code required.
ToolA contact list that was clean a year ago is not clean today. People change jobs, domains expire, and email addresses that once worked now bounce. Sending a campaign to an unvalidated list that has been sitting idle for six months is one of the fastest ways to damage your sender reputation.
The bulk_validate skill takes a list of email addresses and returns a deliverability verdict for each one — valid, invalid, disposable, risky, or a spam trap. The output lets you remove bad addresses before your campaign runs and avoid the cumulative bounce damage that follows.
Email marketers preparing a campaign, sales teams cleaning a prospect database, and operations teams auditing their contact records all use this to restore list quality without individually checking thousands of addresses.
How to bulk validate an email list 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 a list of addresses and helps you interpret the results — which to remove immediately, which to flag for review, and what the overall list health looks like. You can ask follow-up questions about specific patterns in the failures.
How to bulk validate an email list
Once connected (see setup above), use the Email Validator tool — the same steps work with Claude, ChatGPT, Microsoft Copilot, OpenClaw, and any MCP client:
- Paste your email list: "Validate each of these addresses: [paste list]"
- Claude runs bulk validation and returns a result for each address
- Ask: "Which ones should I definitely remove?"
- Use the clean list for your campaign or CRM
Example prompt
Try this with the Email Validator tool
Validate this list of 20 email addresses and tell me which ones are safe to send to, which to remove, and which are from disposable services: [paste list].
Tips
- Ask Claude to group results by verdict type for easier review
- Request a summary: "What percentage of this list is deliverable?"
- For large lists, paste in batches of 50-100 for cleaner conversation threading
Frequently Asked Questions
How do I bulk validate an email list with an AI assistant?
Clean an entire contact list by checking every address for validity, deliverability, and spam traps in one pass. Connect the Email Validator tool to Claude, ChatGPT, Microsoft Copilot, and OpenClaw through ToolRouter, then ask the assistant in plain language. For example: Paste your email list: "Validate each of these addresses: [paste list]" Claude runs bulk validation and returns a result for each address
Which AI assistants can bulk validate an email list?
Claude, ChatGPT, Microsoft Copilot, and OpenClaw can all bulk validate an email list 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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