MailTester Email Verification

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com.mailtester/email-verificationv1.0.1 Domain verified

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

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Call this server's tools from your browser. Nothing to install.

https://app.mailtester.com/mcp

Authorization (optional)

Bearer <api_key>. Get a free key (25 verifications/day) with the get_api_key tool or POST https://app.mailtester.com/agent-gateway/register

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Tool list from our last check. Connect live to refresh it.

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.

emailsinteger

Number of emails to verify (1 credit each).

list_idinteger

Estimate re-verifying an existing list by its id.

operationstring

Operation type: bulk/single (1 credit) or finder (3 credits).

This tool isn't marked read-only, so it may change something on the server or in an account you connected.

I understand, run it anyway

Tools (9)

estimate_cost

Argument	Type	Description
emails	integer	Number of emails to verify (1 credit each).
list_id	integer	Estimate re-verifying an existing list by its id.
operation	string	Operation type: bulk/single (1 credit) or finder (3 credits).

Input schema (JSON)

{
  "type": "object",
  "properties": {
    "emails": {
      "type": "integer",
      "description": "Number of emails to verify (1 credit each)."
    },
    "list_id": {
      "type": "integer",
      "description": "Estimate re-verifying an existing list by its id."
    },
    "operation": {
      "enum": [
        "bulk",
        "single",
        "finder"
      ],
      "type": "string",
      "default": "bulk",
      "description": "Operation type: bulk/single (1 credit) or finder (3 credits)."
    }
  }
}

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.

Argument	Type	Description
term*	string	The status/reason to explain, e.g. 'catch-all', 'GREYLISTED', 'unknown', 'role'. Case-insensitive.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "term"
  ],
  "properties": {
    "term": {
      "type": "string",
      "description": "The status/reason to explain, e.g. 'catch-all', 'GREYLISTED', 'unknown', 'role'. Case-insensitive."
    }
  }
}

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.

Argument	Type	Description
name	string	Your agent's name.
contact	string	Optional operator email or URL.
purpose	string	What you verify emails for.

Input schema (JSON)

{
  "type": "object",
  "properties": {
    "name": {
      "type": "string",
      "description": "Your agent's name."
    },
    "contact": {
      "type": "string",
      "description": "Optional operator email or URL."
    },
    "purpose": {
      "type": "string",
      "description": "What you verify emails for."
    }
  }
}

get_batch_status

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

Argument	Type	Description
list_id*	integer

Input schema (JSON)

{
  "type": "object",
  "required": [
    "list_id"
  ],
  "properties": {
    "list_id": {
      "type": "integer"
    }
  }
}

get_credit_balance

Get the current credit balance and a short usage summary for the account.

No arguments.

Input schema (JSON)

{
  "type": "object",
  "required": [],
  "properties": {}
}

get_list

Get the details of a single bulk verification list by its id.

Argument	Type	Description
list_id*	integer	The id of the bulk verification list.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "list_id"
  ],
  "properties": {
    "list_id": {
      "type": "integer",
      "description": "The id of the bulk verification list."
    }
  }
}

list_lists

List the user's bulk verification lists/jobs, most recent first.

Argument	Type	Description
limit	integer	Maximum number of lists to return.

Input schema (JSON)

{
  "type": "object",
  "required": [],
  "properties": {
    "limit": {
      "type": "integer",
      "default": 25,
      "maximum": 100,
      "minimum": 1,
      "description": "Maximum number of lists to return."
    }
  }
}

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.

Argument	Type	Description
name	string	Optional label for the saved list.
emails*	array	Email addresses to verify.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "emails"
  ],
  "properties": {
    "name": {
      "type": "string",
      "description": "Optional label for the saved list."
    },
    "emails": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "Email addresses to verify."
    }
  }
}

verify_email

Verify the deliverability of a single email address. Returns a verdict (valid, invalid, risky, unknown). Costs 1 credit.

Argument	Type	Description
email*	string	The email address to verify.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "email"
  ],
  "properties": {
    "email": {
      "type": "string",
      "description": "The email address to verify."
    }
  }
}