B75/100

wikipedia.org

Name: wikipedia.org email authentication report
Creator: MailAuthWatch
License: https://creativecommons.org/publicdomain/zero/1.0/

1 fix stands between this domain and a clean A. 1 item below, ordered by how much inbox it is costing you. Measured 0s ago from public DNS in 172 ms.

SPF PASSDKIM NOT FOUNDDMARC REJECTMX OK

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Fix these, in this order, or hand the list to your agent

ranked by impact

No DKIM key found under 79 common selectors.

Either DKIM signing is off, or it uses a selector we did not probe. Without DKIM, forwarded mail and anything that breaks SPF fails DMARC.

Do this: turn on DKIM at your mail provider and at every third-party sender, then add the selector names when monitoring so they are verified daily. If DKIM is already on with an uncommon selector, add it to the check.

Records found

SPF · TXT

v=spf1 include:_cidrs.wikimedia.org ~all

DMARC · _dmarc.wikipedia.org

v=DMARC1; p=reject; rua=mailto:dmarc-rua@wikimedia.org;

DKIM · 0 of 79 selectors

none under common selectors

MX · Custom / other

10 mx-in1001.wikimedia.org
10 mx-in2001.wikimedia.org

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AGENT-READY

A prompt built only from what was measured: the records as published, 1 task in order, exact record values, guardrails, and how to verify. Paste it into Claude, Cursor, Copilot or ChatGPT.

# Fix email authentication for wikipedia.org

You are working on the DNS and mail configuration for wikipedia.org.
Measured by MailAuthWatch on 17 Oct 2026 from public DNS. Grade B (75/100).
Report: https://www.mailauthwatch.com/check/wikipedia.org

## What is published right now (do not assume anything else)
- SPF (TXT wikipedia.org): v=spf1 include:_cidrs.wikimedia.org ~all   — valid, 1 of 10 lookups
- DMARC (TXT _dmarc.wikipedia.org): v=DMARC1; p=reject; rua=mailto:dmarc-rua@wikimedia.org;
- DKIM: no key found under 79 common selectors
- MX: mx-in1001.wikimedia.org, mx-in2001.wikimedia.org  → a custom mail host
- Nameservers: ns0.wikimedia.org, ns1.wikimedia.org …  → DNS host not recognised

## Tasks, in order of impact
…

# Fix email authentication for wikipedia.org

You are working on the DNS and mail configuration for wikipedia.org.
Measured by MailAuthWatch on 17 Oct 2026 from public DNS. Grade B (75/100).
Report: https://www.mailauthwatch.com/check/wikipedia.org

## What is published right now (do not assume anything else)
- SPF (TXT wikipedia.org): v=spf1 include:_cidrs.wikimedia.org ~all   — valid, 1 of 10 lookups
- DMARC (TXT _dmarc.wikipedia.org): v=DMARC1; p=reject; rua=mailto:dmarc-rua@wikimedia.org;
- DKIM: no key found under 79 common selectors
- MX: mx-in1001.wikimedia.org, mx-in2001.wikimedia.org  → a custom mail host
- Nameservers: ns0.wikimedia.org, ns1.wikimedia.org …  → DNS host not recognised

## Tasks, in order of impact
### 1. No DKIM key found under 79 common selectors.
Why: Either DKIM signing is off, or it uses a selector we did not probe. Without DKIM, forwarded mail and anything that breaks SPF fails DMARC.
Turn on DKIM signing at the mail provider and at every third-party service that sends as this domain (CRM, newsletter tool, help desk).
Publish the selector records each service shows. If DKIM is already on with a selector not in the common list, add that selector to the MailAuthWatch check instead.

## Rules
- Publish exactly one SPF record; never add a second v=spf1 TXT.
- Do not remove any include: or ip4: you cannot account for; mail may depend on it.
- Do not set DMARC to p=reject in one step; stage through p=none → quarantine → reject.
- Show the planned DNS changes as a diff (record, old value, new value) before applying them.
- If you cannot access the DNS provider, stop and say exactly what access you need.

## Verify
  dig +short TXT wikipedia.org
  dig +short TXT _dmarc.wikipedia.org
Then open https://www.mailauthwatch.com/check/wikipedia.org?fresh=1 and confirm:
  DKIM found. Target grade: A.

## Report back
List each record you changed (name, type, old value, new value), what you verified, and anything you could not do.

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SPF OK

v=spf1 include:_cidrs.wikimedia.org ~all

DNS lookups: 1 of 10 allowed
Final mechanism: ~all

OK No problems detected.

Include tree

1 / 10

wikipedia.org0

└─ include:_cidrs.wikimedia.org+1

DKIM Not found

DKIM selectors cannot be listed from DNS, so 79 selectors used by common providers were probed. "Not found" means none of those selectors exist; the domain may still sign with a custom selector.

WarningNo DKIM key found under 79 common selectors. If you know your selector, add it to the check; if you have no DKIM at all, enable it at your mail provider.

DMARC OK

v=DMARC1; p=reject; rua=mailto:dmarc-rua@wikimedia.org;

Policy: p=reject
Applies to: 100% of failing mail
Aggregate reports: mailto:dmarc-rua@wikimedia.org

OK No problems detected.

Mail exchange and extras

OK No problems detected.

MTA-STS: Not published optional: enforces TLS for inbound mail
TLS-RPT: Not published
BIMI: Not published optional: brand logo in inboxes, requires p=quarantine or reject

How the grade is calculated

Score 75/100. SPF present and valid. SPF ends with ~all. DMARC present and valid. DMARC policy is reject. DMARC aggregate reporting enabled. SPF contributes up to 35 points, DKIM up to 25, DMARC up to 40 (policy strength and reporting). Any critical issue caps the grade at C. Lookups that failed are shown as "not measured" and never counted as missing.

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