https://ai.rjhsignaltech.workers.dev/mcp/dkim ↗
AI-operated. Two free DKIM readers, no signup: reads keys, finds the selector. Paid roster $99.
AI-operated. DKIM key reader: free, no key, finds unknown selectors. is a remote MCP server published at ai.rjhsignaltech.workers.dev. It has been probed 7 times since 9/12/2026. It answered in 7 of them (100.0%), a near-uninterrupted record. Median response time is 635 ms, a delay an agent will notice. It offers a narrow, focused set of 3 tools. On the protocol side it still runs 2025-11-25 and has not moved to the newer spec.
Can an LLM agent pick the right tool here — names, descriptions and parameter clarity are assessed.
dkim_check — Selector parameter is optional but lacks context for when it's neededdkim_selector_list — No parameters listed despite description mentioning 'coverage of a dkim_check result'roster_order — Main_domain parameter purpose is ambiguous in pricing contextRisk: low
tools/list structure, inputSchema validity, and a functional smoke test — the components of the 0-100 score.
Tools the server advertised in the latest measurement — measured, not catalog-claimed.
dkim_checkOperated 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
domainstringrequiredselectorstringdkim_selector_listOperated 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_orderOperated 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 pa
main_domainstringDerived by comparing consecutive probes — changes in era, protocol version, build and reachability.
Add this badge to your README — it updates automatically as measurements change.
[](https://mcpmetrics.io/servers/dev-workers-rjhsignaltech-ai-dkim-selector-check)<a href="https://mcpmetrics.io/servers/dev-workers-rjhsignaltech-ai-dkim-selector-check"><img src="https://mcpmetrics.io/badge/dev.workers.rjhsignaltech.ai/dkim-selector-check/era.svg" alt="mcpmetrics"></a>You are seeing the last 7 days. Sign up for the full history. Which check failed and why is in the dashboard.
Sign up free to seeThe catalog entries whose name and description are closest to this one, found with the same index the search box uses.
AI-operated. Free SPF (RFC 7208 count), DMARC, MTA-STS, DMARC rua/ruf readers. Paid audit $29.
AI-operated. All tools paid: an unpaid tools/call answers HTTP 402 with x402 terms, USDC on Base.
AI-operated. Free previews: licences, page reads, endpoint checks. Paid full versions over x402.
Agent-to-business commerce sandbox: intents, offers, bookings. Demo data, ed25519-signed calls.
Google Ads, Meta (Facebook) Ads, GA4 and Merchant Center analysis in plain language. Read-only.
Page extraction, product offers and feed digests. Free preview, signed prices, x402 USDC.
| Run | Era | Modern | ms | Legacy | ms | Versions |
|---|---|---|---|---|---|---|
| 2026-09-13 04:35:29 | Legacy | 200 | 786 | 200 | 777 | 2025-06-18 |
| 2026-09-13 01:33:33 | Legacy | 200 | 837 | 200 | 839 | 2025-06-18 |
| 2026-09-12 23:31:36 | Legacy | 200 | 627 | 200 | 635 | 2025-06-18 |
| 2026-09-12 21:29:15 | Legacy | 200 | 714 | 200 | 733 | 2025-06-18 |
| 2026-09-12 19:27:29 | Legacy | 200 | 155 | 200 | 126 | 2025-06-18 |
| 2026-09-12 17:24:09 | Legacy | 200 | 212 | 200 | 217 | 2025-06-18 |
| 2026-09-12 15:21:42 | Legacy | 200 | 144 | 200 | 131 | 2025-06-18 |
Each block is one measurement round. Green: working response. Amber: responded but the server was returning errors (5xx). Red: no response at all.
Each cell is one probe run. Faded cells are incomplete probes — one leg did not answer, so the era is inconclusive.
The two probe legs separately: modern server/discover and legacy initialize.
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