All servers · Email & messaging

MailTester Email Verification

com.mailtester/email-verification · v1.0.1

Measured by MCP Station

Description written by the publisher, not verified

Verify emails (valid/invalid/risky/unknown): MX, SMTP, catch-all, disposable. Free agent key.

Connect

claude mcp add --transport http email-verification https://app.mailtester.com/mcp

{
  "mcpServers": {
    "email-verification": {
      "url": "https://app.mailtester.com/mcp"
    }
  }
}

Tools as reported by the server

• get_api_key
  Get your own free API key for this server (no account needed; 25 email verifications per day). Optional: the verification tools already work without a key on a shared trial. Returns the key once — reconnect with 'Authorization: Bearer <api_key>' for your own quota and the list tools.
• get_credit_balance
  Get the current credit balance and a short usage summary for the account.
• list_lists
  List the user's bulk verification lists/jobs, most recent first.
• get_list
  Get the details of a single bulk verification list by its id.
• explain_result
  Explain what a verification status or reason means in plain English, with a send recommendation. Covers valid, invalid, catch-all/accept-all, unknown, greylisted, disposable, role, free, spam-trap, abuse, do-not-mail, no-mx, disabled, and network. Use when a user asks what a result means.
• verify_email
  Verify the deliverability of a single email address. Returns a verdict (valid, invalid, risky, unknown). Costs 1 credit.
• verify_batch
  Verify a batch of email addresses (up to 25 per call with an agent key). Returns per-email verdicts and saves a list. Costs 1 credit per email.
• estimate_cost
  Estimate the credit cost of a verification before running it, and whether the user can afford it. Provide either a count of emails, a list_id to re-verify, or an operation ('single'/'finder'). Always quote this before proposing anything billable.
• get_batch_status
  Get the progress and status of a bulk verification list/job by id.

Repository · Website · JSON · Text for agents · Registry updated 2026-10-08