• CLEAN
  • INVALID
  • RISKY
  • REJECTED

How to validate email deliverability with your AI

Connect WhoisXML to your AI client once. Your agent then handles the technical checks for any list you provide.

Ask AI about this page

Short answer

How can I use AI to check if my email list is valid?

Your agent uses WhoisXML to run syntax checks and MX record lookups on your contact data. This identifies dead or malformed addresses so you can clean your lists. You'll get a clear breakdown of which emails are safe to use.

The results.

Where your data lands.

The AI processes your list and sorts every address into specific categories.

CLEAN

Ready to send

The AI finds addresses with correct syntax and active mail servers. These are safe for your outreach.

INVALID

Dead ends

The AI flags addresses that fail syntax or domain checks. You can pull these out to avoid bounces.

RISKY

Needs human review

The AI identifies catch-all domains or suspicious patterns. You'll need to decide if these are worth contacting.

REJECTED

Hard bounces

The AI catches addresses that definitely don't exist. Removing these protects your sender reputation.

The workflow

What your AI does when the list arrives.

Your agent performs the technical lookups so you don't have to check rows manually.

  1. Syntax check

    The AI scans your list for typos, missing symbols, or illegal characters in the email strings.

    verify_email

  2. Domain verification

    Your agent checks the domain of each email to ensure it actually exists and can receive mail.

    verify_email

  3. MX record lookup

    The AI confirms that the domain has valid Mail Exchange records configured.

    verify_email

  4. List categorization

    The AI organizes the results into valid, invalid, and risky groups based on the technical data.

    verify_email

Try it

Copy these to start.

Use these prompts to start the validation process.

Starting points

Swap the bracketed text for your actual file names or sheet names.

WhoisXML API Connector

You're all set. Choose your MCP client and follow the setup instructions.

Connector linkhttps://edge.vinkius.com/vk_preview_8ZfNhpmiBZIzJPrO0afeX9bez2c5QGEBhxhzGkAj/mcp

Claude Desktop

Follow the steps below to connect in seconds.

  1. 1In Claude Desktop, open Settings → Connectors.
  2. 2Click “Add custom connector” and paste the connector link above as the remote MCP server URL.
  3. 3Click Add and start a new chat — WhoisXML API capabilities are ready to use.
Configuration · claude_desktop_config.jsonCopy
{
  "mcpServers": {
    "whoisxml-mcp": {
      "url": "https://edge.vinkius.com/vk_preview_8ZfNhpmiBZIzJPrO0afeX9bez2c5QGEBhxhzGkAj/mcp"
    }
  }
}
Copy into chat04

  • Verify the email addresses in this Google Sheet for syntax errors.

  • Check the MX records for the contacts in my lead_list.csv file.

  • Clean this list of email addresses and tell me which ones are invalid.

  • Scan the contact column in my CRM export and flag any dead email addresses.

  • Claude
  • ChatGPT
  • Cursor
  • VS Code
  • Windsurf
  • Claude Code
  • JetBrains
  • Cline

Start here

Connect WhoisXML once, then ask.

Link the WhoisXML MCP to your client. Your credentials stay encrypted on our side, and you can start cleaning lists immediately.

Connect WhoisXML to your AI

FAQ

How this task behaves.

  • 01

    Can the AI automatically delete invalid emails from my CRM?

    No. The AI identifies and flags the invalid addresses, but you must perform the actual deletion in your CRM.

  • 02

    Does the AI check if an email inbox is actually full?

    No. The tool checks syntax and MX records to confirm the domain can receive mail, but it does not check individual mailbox capacity.

  • 03

    Will this prevent my emails from going to spam?

    It helps by removing invalid addresses that cause bounces, but it cannot guarantee deliverability.

  • 04

    Can I use this to verify physical mailing addresses?

    No. This tool is for email syntax and domain verification only.

  • 05

    How does the AI handle catch-all domains?

    The AI identifies them as risky, but it cannot confirm if a specific user exists on a catch-all domain.

  • More questions about WhoisXML? See everything the WhoisXML Connector can do

Connect WhoisXML API to Claude, Cursor, ChatGPT & more