# MailValid Email Verification

> Verify emails: syntax, MX, SMTP mailbox, disposable, role and catch-all checks. Single and bulk.

- name: io.mailvalid/email-verifier
- version: 1.0.0
- connection class: R1 (autonomous)
- trust: 82/100 flags: no-repository
- quality: 81/100 (new)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/io.mailvalid%2Femail-verifier
- tools: https://api.protogrid.dev/v1/servers/io.mailvalid%2Femail-verifier/tools

**An agent can connect on its own if it already holds `X_API_KEY`, `X_API_KEY`.** Remote endpoint behind a static API key or header. The registry never sees the value; the agent fills the placeholder.

## Connection (mcpServers)

```json
{
  "mcpServers": {
    "email-verifier": {
      "type": "http",
      "url": "https://mailvalid.io/mcp/",
      "headers": {
        "X-API-Key": "${X_API_KEY}",
        "Authorization": "${X_API_KEY}"
      }
    }
  }
}
```

Placeholders to fill: `${X_API_KEY}`, `${X_API_KEY}`.

## Trust

- hygiene: 80
- liveness: 98
- freshness: 100
- provenance: 55
- drivers: +dns-namespace +website +reachable +uptime-95% +updated-6d-ago -no-repository
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 81/100 (new)

### protocol: 75 (weight 25)

- warn `protocol.modern`: newest supported version is 2025-11-25; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
- n/a `protocol.stateless`: only applies to 2026-07-28 servers
- pass `protocol.transport`: streamable HTTP
- n/a `protocol.list_ttl`: only applies to 2026-07-28 servers

### authorization: n/a (weight 15)

- n/a `auth.prm`, `auth.as_metadata`, `auth.cimd`: no remote uses OAuth
- n/a `auth.secret_in_url`: no templated URL

### tool hygiene: 86 (weight 30)

- pass `tools.descriptions`: every tool has a description
- pass `tools.description_length`: descriptions are concise
- pass `tools.schemas`: every tool has an object input schema
- pass `tools.annotations`: 6 of 6 tools declare readOnlyHint or destructiveHint
- fail `tools.directory_hints`: no tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: list_bulk_jobs (destructiveHint, idempotentHint, openWorldHint); verify_email (destructiveHint, idempotentHint); submit_bulk_verification (destructiveHint, idempotentHint); …
- pass `tools.token_cost`: about 641 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump

### stability: n/a (weight 15)

- n/a `stability.changes`, `stability.rug_pull`: tool history recorded for 5 of the 7 days needed

### dependencies: n/a (weight 15)

- n/a `deps.known_vulns`, `deps.mcp_sdk_version`, `deps.resolvable`: no npm or PyPI package

- tools: 6, about 641 tokens to load them all
- tool set hash: cd1aa301b7e867cac9551d4fddcf6ba1
- badge: [![protogrid quality](https://protogrid.dev/badge/io.mailvalid/email-verifier.svg)](https://protogrid.dev/servers/io.mailvalid/email-verifier)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

_No tool definition changes recorded._

## Remotes

- https://mailvalid.io/mcp/ (streamable-http, auth api_key ${X_API_KEY}, reachable true, uptime30d 0.95238096)

## Packages

_none_

## Tools (6)

- `cancel_bulk_job`: Cancel a pending or processing bulk job and release any reserved credits.
    Requires an API key.
- `get_bulk_job`: Get the status, progress, and (when complete) results of a bulk job by
    its job_id. Requires an API key.
- `get_credit_balance`: Return your current credit balance and lifetime usage. Requires an API key.
- `list_bulk_jobs`: List your recent bulk verification jobs (paginated, newest first).
    Optionally filter by status. Requires an API key.
- `submit_bulk_verification`: Queue a list of emails for asynchronous verification. Reserves up to N
    credits (final charge settles on completion). Poll get_bulk_job for status
    and results. Optionally provide webhook_url for a completion callback.
    Requires an API key. Returns {job_id, status, total_emails, credits_reserved}.
    
- `verify_email`: Verify a single email's deliverability (syntax, DNS/MX, SMTP mailbox,
    disposable / role / catch-all detection, confidence score).

    Costs 1 credit for a billable result (valid/invalid/catch_all/do_not_mail),
    whether fresh or served from cache. `unknown` results are free. Requires an
    API key. Returns {success, credits_used, result}.