MCP server

Email Auth Checker

dev.workers.quietworklabs.email-auth-check/email-auth-check

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

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

Working at last checkAbout 713 tokens per request once connected4 tools

Website

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

At a glance

Type: MCP server
Publisher: Not verified
Status: Working at last check
Tools: 4
Token cost: About 713 tokens per request
Sets up in: Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok
Last checked: 26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to Cursor Add to VS Code VS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

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

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

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

Gemini CLI

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

Cursor

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

VS Code

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

Antigravity

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

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"email-auth-check","server_url":"https://email-auth-check.quietworklabs.workers.dev/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"email-auth-check","server_url":"https://email-auth-check.quietworklabs.workers.dev/mcp"}

Tools

dmarc_check ~150 tokens
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
domain_expiry ~164 tokens
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: $0.00
email_auth_report ~235 tokens
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
spf_lookup_count ~164 tokens
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

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