Email Auth Checker MCP Server

by workers-quietworklabs-email-auth-check Your server? Claim it

answering

Email Auth Checker is answering right now. Last checked 7 min ago. It exposes 4 tools.

SPF, DKIM, DMARC, MTA-STS and domain-expiry checks for any domain, with SPF lookup counts.

Uptime history 7 days of history

7 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

182 ms

Response time

average over 24h

open, no key

Access

streamable-http

Nothing serious here today

Today is the operative word: we check Email Auth Checker every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 7 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add email-auth-check --transport http https://email-auth-check.quietworklabs.workers.dev/mcp

Settings → Connectors → Add custom connector, then paste this address

https://email-auth-check.quietworklabs.workers.dev/mcp

~/.codex/config.toml

[mcp_servers.email-auth-check]
url = "https://email-auth-check.quietworklabs.workers.dev/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "email-auth-check": {
      "url": "https://email-auth-check.quietworklabs.workers.dev/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "email-auth-check": {
      "type": "http",
      "url": "https://email-auth-check.quietworklabs.workers.dev/mcp"
    }
  }
}

Available tools 4

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

dmarc

dmarc_check

Finds and validates a domain's DMARC record (falls back to the organizational domain): policy, subdomain policy, pct, alignment modes, rua/ruf, and whether external report domains authorized reports (RFC 7489 7.1). Deterministic, no AI. Price: $0.001 USDC per call via x402 (Base); the first 5 calls per day per client are free.

domain

domain_expiry

Registration data for a domain from the registry's RDAP server (IANA bootstrap): registrar, created/updated/expiry dates, days until expiry with ok/expiring_soon/expired status, EPP status codes, nameservers and DNSSEC. Works for gTLDs and ccTLDs that publish RDAP. Deterministic, no AI. Price: $0.002 USDC per call via x402 (Base); the first 5 calls per day per client are free.

email_auth_report

Full email-auth report for a domain: SPF (recursive 10-lookup count, void lookups, +all/?all, terms after all), DMARC (policy, pct, alignment, rua authorization), DKIM (keys and RSA key bits at common selectors or your own via selectors=), MX/null MX, MTA-STS policy, TLS-RPT, BIMI, and a Gmail/Yahoo/Outlook bulk-sender readiness verdict. Deterministic DNS-over-HTTPS, no AI. Price: $0.003 USDC per call via x402 (Base); the first 5 calls per day per client are free.

spf

spf_lookup_count

Expands a domain's SPF record recursively (include/redirect) like a receiver does and counts DNS-querying terms against the RFC 7208 limit of 10 and void lookups against the limit of 2. Returns per-term lookup costs, problems (permerror causes) and warnings. Deterministic, no AI. Price: $0.001 USDC per call via x402 (Base); the first 5 calls per day per client are free.

Endpoints

URL	Transport	State	Latency	Checked
https://email-auth-check.quietworklabs.workers.dev/mcp	streamable-http	answering	1200 ms	7 min ago

Alternatives to Email Auth Checker

same job, measured the same way

x402 DNS Email Auth Checker

by workers-microtools-x402-x402-dns-auth-checker

Audit SPF, DKIM, DMARC, MX, BIMI, MTA-STS for a domain; score + grade. $0.003 USDC/call via x402.

2 tools answering

Dmarc Spf Audit

by dawaxwx

Complete domain email-auth audit in one call: SPF with RFC 7208 lookup counting, DKIM selector pr...

1 tools answering

Palisade

by palisade

Monitor and manage email authentication (SPF, DKIM, DMARC, MTA-STS, BIMI) for your domains.

101 installs/wk answering

DomainCheck

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Domain and email trust checks for agents: DNS, SPF/DMARC, disposable email. By Crypto Money Maker

2 tools answering

DomainRef - domain and email security check

by domainref

Pay-per-call domain and email security check: SPF, DKIM, DMARC, TLS, DNSSEC, BIMI, with exact fixes.

2 tools answering

DnsGuard

by workers-mike-tusa-dnsguard

Check a domain's email authentication: SPF, DKIM, DMARC, BIMI, MX, MTA-STS, TLS-RPT. Score + fixes.

1 tools answering

DMARC Shark — Email DNS Checker

by dmarcshark

Check a domain's public SPF, DMARC, MX and DKIM DNS records on demand. No account required.

2 tools answering

MX Verdict

by mxverdict

Free, read-only email and DNS checks: SPF, DKIM, DMARC, MX, DNS records, blocklists, domain health.

7 tools answering

Email Auth Checker — questions

Answers built from our own checks of this server.

What can Email Auth Checker do?

It exposes 4 tools, read directly from the server on our last check. Among them: dmarc_check, domain_expiry, email_auth_report, spf_lookup_count. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Email Auth Checker working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 182 ms. The bar chart above shows every period we have measured.

How do I connect Email Auth Checker?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Email Auth Checker need an API key?

No. Email Auth Checker completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 4 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Email Auth Checker?

It answers our handshake in 182 ms on average, which is faster than 81% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.