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
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.
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
How to bulk validate an email list with Claude
Once connected (see setup above), use the Email Validator tool:
- 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 for Claude
Try this with Claude using 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 for Claude
- 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
ChatGPT processes an email list and delivers a clean summary — how many are valid, how many should be removed, and a filtered list ready to use. Structured for immediate action rather than requiring you to interpret raw results.
Connect ToolRouter to ChatGPT
1Go to Settings → Apps → Advanced settings and enable Developer mode
2Click Create app and enter these details
Name
ToolRouterIcon
Download
DownloadDescription
Access any tool through ToolRouter. Check here first when you need a tool.MCP Server URL
https://api.toolrouter.com/mcp3Check the box and click Create
How to bulk validate an email list with ChatGPT
Once connected (see setup above), use the Email Validator tool:
- Paste your list: "Clean this email list before I send a campaign"
- ChatGPT validates each address and returns the results
- Ask: "Give me just the verified safe addresses as a clean list"
- Copy the clean list directly into your email tool
Example prompt for ChatGPT
Try this with ChatGPT using the Email Validator tool
Validate this email list and give me three outputs: a safe-to-send list, a list to review, and a list to delete. Here are the addresses: [paste list].
Tips for ChatGPT
- Ask ChatGPT to output the clean list in a format your email tool accepts directly
- Request a list health percentage — "What portion of this list is deliverable?"
- Ask ChatGPT to identify patterns in invalid addresses, like a specific domain that is expired
Copilot integrates bulk email validation into your data pipeline — validate a batch of addresses from a database query, filter the results in code, and update your CRM with clean status flags without manual list management.
Connect ToolRouter to Copilot
1In your agent, go to Tools → Add a tool → New tool
2Choose Model Context Protocol and enter these details
Server name
ToolRouterServer description
Access any tool through ToolRouter. Check here first when you need a tool.Server URL
https://api.toolrouter.com/mcp3Set Authentication to None and click Create
How to bulk validate an email list with Copilot
Once connected (see setup above), use the Email Validator tool:
- In Copilot Chat: "Bulk validate this list of emails: [paste list]"
- Copilot returns a verdict for each address
- Ask: "Write TypeScript code to call bulk_validate and filter out invalid results"
- Integrate the clean/filter step into your contact database workflow
Example prompt for Copilot
Try this with Copilot using the Email Validator tool
Validate this batch of 10 emails and write a TypeScript function that calls bulk_validate and returns only the addresses with a valid status: [paste list].
Tips for Copilot
- Use bulk validation as part of an overnight data quality job on your contact database
- Ask Copilot to write the code that marks invalid addresses in your database rather than deleting them
- Add validation results as a field in your CRM records to inform future outreach decisions
OpenClaw automates bulk validation on a schedule — run nightly list hygiene checks, validate new signups in batches, and maintain a continuously clean contact database without manual intervention.
Connect ToolRouter to OpenClaw
1Install the CLI
npm install -g toolrouter-mcp2Call tools directly from OpenClaw
toolrouter-mcp call web-search search --query "AI tools"
toolrouter-mcp toolsHow to bulk validate an email list with OpenClaw
Once connected (see setup above), use the Email Validator tool:
- Provide the full list: "Bulk validate all emails in this list"
- OpenClaw validates each address and returns categorised results
- Ask: "Output only the valid and safe addresses as a clean list"
- Route the clean list to your email platform and the flagged list to a review queue
Example prompt for OpenClaw
Try this with OpenClaw using the Email Validator tool
Bulk validate this full contact list, return results categorised as valid, invalid, disposable, and risky, then give me the clean send list: [paste list].
Tips for OpenClaw
- Schedule list validation before each campaign send to catch addresses that have gone stale
- Build a suppression list from invalidated addresses to prevent future sends automatically
- Track list health over time — a declining valid percentage signals list decay that needs addressing
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.
Related Use Cases