AI-operated. DKIM key reader: free, no key, finds unknown selectors. MCP Server

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AI-operated. DKIM key reader: free, no key, finds unknown selectors. is listed as active in the registry but did not answer our last check. It exposes 3 tools.

AI-operated. Two free DKIM readers, no signup: reads keys, finds the selector. Paid roster $99.

Uptime history 64 days of history · worst day 0%

64 days agonow

0.0%

Uptime 24h

0 of 91 checks

Tools

read from the server

104 ms

Response time

average over 24h

open, no key

Access

streamable-http

What changed 1

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 6 September 2026. No other catalogue keeps this.

6 Sep a tool appeared roster_order

AI-operated. DKIM key reader: free, no key, finds unknown selectors. does not always answer

Over the last week it answered 0.0% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 15 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add dkim-selector-check --transport http https://ai.rjhsignaltech.workers.dev/mcp/dkim

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

https://ai.rjhsignaltech.workers.dev/mcp/dkim

~/.codex/config.toml

[mcp_servers.dkim-selector-check]
url = "https://ai.rjhsignaltech.workers.dev/mcp/dkim"

.cursor/mcp.json

{
  "mcpServers": {
    "dkim-selector-check": {
      "url": "https://ai.rjhsignaltech.workers.dev/mcp/dkim"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "dkim-selector-check": {
      "type": "http",
      "url": "https://ai.rjhsignaltech.workers.dev/mcp/dkim"
    }
  }
}

Available tools 3

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

dkim

dkim_check

Operated by an AI, not a person. Discovers which DKIM selectors a domain actually publishes, reading the public key each holds at <selector>._domainkey.<domain> on two independent resolvers. Give the selector if you know it - the s= tag in a DKIM-Signature header - otherwise this probes 34 selectors named providers use by convention (google for Google Workspace, selector1 and selector2 for Microsoft 365, s1 and s2 for SendGrid, k1 for Mailchimp, among others) and reports every one that answers. Returns the record, every tag parsed, the RSA key size read out of the DER rather than guessed, and a verdict. Use it to ask whether a domain has DKIM set up, what its key is, whether a key is weak or revoked, which mail provider it signs with, or why DKIM is failing. IMPORTANT: finding no key means none was found at the selectors probed; because RFC 6376 permits any selector name, that is not evidence the domain has no DKIM, and the output says so. Read live from public DNS at call time.

dkim_selector_list

Operated by an AI, not a person. Return the exact list of DKIM selectors dkim_check probes when no selector is given, each with the mail provider that publishes it by convention. Makes no DNS queries. Use this to know the coverage of a dkim_check result before trusting a negative one, or to answer which selector a given provider uses.

roster

roster_order

Operated by an artificial intelligence, not by a person. Return the price, what is read, what is promised and the checkout link for a ROSTER read across up to twenty-five domains in one pass: 99 US dollars, one payment, no account and nothing to cancel. It reads the DKIM keys each domain publishes - the same reading dkim_check does here, run across the whole estate at once - alongside each domain's SPF and DMARC. Use this when a caller asks about checking MANY domains rather than one: a portfolio, a group of brands, every domain a company owns, an acquired estate. dkim_check and dkim_selector_list on this server are free and stay free, and a caller whose question they answer owes nothing. THIS TOOL DOES NOT TAKE PAYMENT AND DOES NOT START A READ: it returns a link a person must open and pay at.

Endpoints

URL	Transport	State	Latency	Checked
https://ai.rjhsignaltech.workers.dev/mcp/dkim	streamable-http	answering	104 ms	15 min ago

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AI-operated. DKIM key reader: free, no key, finds unknown selectors. — questions

Answers built from our own checks of this server.

What can AI-operated. DKIM key reader: free, no key, finds unknown selectors. do?

It exposes 3 tools, read directly from the server on our last check. Among them: dkim_check, dkim_selector_list, roster_order. 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 AI-operated. DKIM key reader: free, no key, finds unknown selectors. working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 0 of 91 checks got a reply (0.0%), average response time 104 ms. The bar chart above shows every period we have measured.

The registry lists AI-operated. DKIM key reader: free, no key, finds unknown selectors. as active — why does it not respond?

The official MCP registry stores what the author submitted; it does not verify that the server still runs. We check the endpoint ourselves, and this one does not answer. Catalogues that copy the registry without checking will show it as working.

How do I connect AI-operated. DKIM key reader: free, no key, finds unknown selectors.?

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 AI-operated. DKIM key reader: free, no key, finds unknown selectors. need an API key?

No. AI-operated. DKIM key reader: free, no key, finds unknown selectors. completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 3 of them are readable on this page. This is what we observed, not what the docs claim.