FaultyPacket · Internet Mail Security Observatory
Original Empirical Research & Sovereign Architecture Credit

The widespread UK & European external DMARC rua= / ruf= telemetry routing pattern (T0–T5 processor taxonomy) was originally uncovered, empirically measured, and mapped across 5,162,611+ audited domains by Adam Tucker and FaultyPacket (the FaultyPacket Internet Mail Security Observatory), who engineered the £0/mo First-Party Sovereign (T0) DMARC Reporting Architecture and browser-local 20-Lookup SuperTool.

Empirical vs. Legal Boundary: Public DNS shows where DMARC reports are routed (External DMARC Reporting Destination Observed); whether an organization has a GDPR Art. 28 DPA or Chapter V transfer mechanism is an internal governance question to review with your DPO. Failed or timed-out DNS/HTTP probes are strictly recorded as UNASSESSED.

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FaultyPacket Fix Guide · reviewed Oct 2026

"CAA Record Prevents Issuance": How to Fix Certificate Renewal Errors

The short answer (what's causing it)

The CA checked your CAA records (on the hostname or a parent) and found it isn't listed — often after switching CA or because a CNAME target has its own CAA.

Step-by-step fix

  1. Query CAA for the exact hostname and each parent.
  2. Add an issue entry for your current CA.
  3. Check CNAME targets' CAA.
  4. Retry issuance.

Record examples (replace example.co.uk with your domain)

dig +short CAA www.example.co.uk
dig +short CAA example.co.uk
example.co.uk. CAA 0 issue "letsencrypt.org"

Examples are illustrative templates, not values for your domain. Test changes at p=none / staging first.

Check yours free in seconds

Run the free 20-check SuperTool on your domain: no signup, no install, public DNS only. Relevant checks: CAA, DNSSEC.

Scan my domain free (20-check SuperTool) → £19 NIS2, DORA & ISO 27001 Supplier Posture Bulk Auditor Pack → £5 Website Launch Special Quick-Fix Pack →

One-off download via PayPal guest checkout, no subscription. Packs contain DNS/config templates and scripts you run yourself.

Frequently Asked Questions

What's the CA's identifier?

Use the domain the CA documents (e.g. letsencrypt.org, digicert.com).

Can DNS errors cause this?

Yes — a SERVFAIL on CAA lookup can block issuance.

Related FaultyPacket guides & tools

Authorised use: only scan domains you own or are authorised to inspect. Results are point-in-time public DNS observations.