# scan.mx Email Diagnostics

> Email deliverability check: MX, SPF, DKIM, DMARC, blacklists, MTA-STS, DNSSEC, BIMI. Graded, no key.

- name: mx.scan/diagnostics
- version: 1.1.0
- connection class: R0 (autonomous)
- trust: 82/100 flags: no-repository
- quality: 85/100 (good)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/mx.scan%2Fdiagnostics
- tools: https://api.protogrid.dev/v1/servers/mx.scan%2Fdiagnostics/tools

**An agent can connect right now, no human step.** Remote endpoint, no authentication, reachable on the last probe.

## Connection (mcpServers)

```json
{
  "mcpServers": {
    "diagnostics": {
      "type": "http",
      "url": "https://api.scan.mx/mcp"
    }
  }
}
```


## Trust

- hygiene: 80
- liveness: 99
- freshness: 100
- provenance: 55
- drivers: +dns-namespace +website +reachable +uptime-97% +updated-7d-ago -no-repository
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 85/100 (good)

### 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`: 9 of 9 tools declare readOnlyHint or destructiveHint
- fail `tools.directory_hints`: no tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: check_mx (destructiveHint, idempotentHint); check_blacklist (destructiveHint, idempotentHint); check_dnssec (destructiveHint, idempotentHint); …
- pass `tools.token_cost`: about 1,119 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump

### stability: 100 (weight 15)

- pass `stability.changes`: 3 tool changes in 30 days
- pass `stability.rug_pull`: no tool changed its meaning under the same name

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

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

- tools: 9, about 1,119 tokens to load them all
- tool set hash: d9f46f6908121b23096d02747a98241e
- tools last changed: 2026-10-13T17:09:36.369Z
- badge: [![protogrid quality](https://protogrid.dev/badge/mx.scan/diagnostics.svg)](https://protogrid.dev/servers/mx.scan/diagnostics)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

- 2026-10-13 `check_bimi` added
  - Check the domain BIMI record at default._bimi: the SVG logo URL, the VMC/CMC certificate, and the DMARC enforcement BIMI needs.
- 2026-10-13 `check_dnssec` added
  - Check DNSSEC validation and DNS health: delegation, nameserver count, SOA, and reverse DNS of the mail servers.
- 2026-10-13 `check_mta_sts` added
  - Check the domain MTA-STS policy (_mta-sts TXT and the HTTPS policy file, mode and MX coverage) and its TLS-RPT reporting record.

Full history: https://api.protogrid.dev/v1/servers/mx.scan%2Fdiagnostics/changes

## Remotes

- https://api.scan.mx/mcp (streamable-http, auth none, reachable true, uptime30d 0.96581197)

## Packages

_none_

## Tools (9)

- `check_bimi`: Check the domain BIMI record at default._bimi: the SVG logo URL, the VMC/CMC certificate, and the DMARC enforcement BIMI needs.
- `check_blacklist`: Check whether the domain and its mail server IPs are listed on the Spamhaus (ZEN, DBL, ZRD, AuthBL), SpamCop, GBUdb and PSBL blocklists.
- `check_dkim`: Check DKIM signing keys for a domain. Without a selector, common provider selectors are probed. Pass an explicit selector to look up that exact key at selector._domainkey.
- `check_dmarc`: Check the domain DMARC policy at _dmarc: presence, policy strength (none/quarantine/reject), and reporting.
- `check_dnssec`: Check DNSSEC validation and DNS health: delegation, nameserver count, SOA, and reverse DNS of the mail servers.
- `check_domain`: Run the full email and DNS deliverability check for a domain: MX, SPF, DKIM, DMARC, DNS health, provider detection, and blacklists. Returns a letter grade (A+ to F, where specific weaknesses cap the grade), a 0 to 100 score, and every individual check with its RFC reference. Set include_smtp to also run a live SMTP probe of the mail servers: the probe is non-blocking, so when smtp_status is "pending" or "running" call this tool again (poll_after_seconds hints how long to wait) until smtp_status is "complete" and the SMTP checks appear in checks.
- `check_mta_sts`: Check the domain MTA-STS policy (_mta-sts TXT and the HTTPS policy file, mode and MX coverage) and its TLS-RPT reporting record.
- `check_mx`: Check the MX records of a domain: presence, hostnames, resolution, null-MX, and common misconfigurations.
- `check_spf`: Check the domain SPF policy: presence, syntax, the all qualifier, and the 10-lookup limit.