MailTester MCP server

Which servers in the official MCP registry are MailTester's own, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-16

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Whose server it is

Registry namecom.mailtester/email-verificationverified in the MCP registry

The registry name sits under mailtester.com. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-16

Stateanswerschecked 2026-10-16
Tools9
Server calls itselfMailTester
Server version1.0.0
Protocol version2025-06-18

On 2026-10-16 the server answered initialize and tools/list without a sign-in. First answer in 605 ms.

Tools it offers9 tools · read 2026-10-16

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…
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…
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…
get_batch_status
Get the progress and status of a bulk verification list/job by id.

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

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

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.