Tools / Email finder / Tool
Someone gave you an address on a call, or it came off a form. Ask your agent to check it: contact.verify returns whether the mailbox is valid, invalid or unknown, a certainty grade when the provider gives one, the catch-all flag when known, and which mail service the domain runs on.
Ask your agent
Is this email address real? It came in through our demo form.
Connect RouterGrowth once, then ask in plain words. New workspaces start with $1 of credit. Get a key or read the setup guide.
A real run
One call to contact.verify (email deliverability check), run through RouterGrowth on October 16, 2026. These are the first rows it returned; fields that name a person are masked.
| status | certainty | mx_provider | |
|---|---|---|---|
| k***@***.com | valid | ultra_sure |
One address at a small consulting domain: valid and ultra_sure, on a Google Workspace mail server.
Step by step
Add the MCP server to Claude, ChatGPT, Claude Code, Codex or Cursor, or call the REST API with your RouterGrowth key.
Type it or point the agent at the message or form where it appears.
Status, certainty, catch-all and mail provider come back in a few seconds.
If the address is invalid, the agent can look up the right one with contact.find from the name and domain.
Price
List prices on this call, read from the catalog when this page was built. The exact figure is quoted before every run, and a monthly plan lowers it.
In practice
You describe the job; the agent picks the calls, shows the price and runs them.
Is this email address real? It came in through our demo form.
This address bounced. Verify it, and if it is invalid find the correct work email for the same person.
Connect
One MCP server for Claude, ChatGPT, Claude Code, Codex and Cursor, or the same call over the CLI and REST with the input above.
claude mcp add --transport http routergrowth https://api.routergrowth.com/mcp
npm install -g routergrowth && routergrowth setup
routergrowth run -c contact.verify -i '{"email": "alex@example.com"}'curl -X POST https://api.routergrowth.com/v1/run \
-H "Authorization: Bearer $ROUTERGROWTH_API_KEY" \
-d '{"capability": "contact.verify", "input": {"email": "alex@example.com"}}'Worth knowing
A misspelled name or domain returns invalid, which is the moment to ask for the address again.
The mx_provider field shows whether the domain runs on Google, Microsoft or something else, useful when judging an unknown.
The charge covers the verdict returned. The quote is shown before the call.
FAQ
Usually a few seconds. The example above took about three.
No. It answers whether the mailbox accepts mail, not whose it is.
Rarely, for instance when a mailbox is closed after the check or the domain is catch-all. Recheck addresses kept for months.
No. The check runs on RouterGrowth's providers with your RouterGrowth key.
More on Email finder
Reading this as an agent? This page as markdown: /tools/email-finder/address-verification.md
Connect your agent once. The first calls run on the $1 that comes with signup.