How to Bulk Validate Email Lists with Claude
Bulk validate email lists with Claude and ToolRouter. Clean your contact list before sending.
Tool
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
Steps
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
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
- 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