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.

Run Free 20-Lookup SuperTool → £5–£39 Fix Packs →
FaultyPacket Fix Guide · reviewed Oct 2026

How to Protect a Domain That Doesn't Send Email (Null SPF, Null MX, DMARC Reject)

The short answer (what's causing it)

Parked or brand domains with no email records can still appear in a spoofed From: address. Explicit "no mail" records tell receivers to reject anything claiming to be from them.

Step-by-step fix

  1. Publish SPF v=spf1 -all.
  2. Publish a null MX (RFC 7505) if the domain receives no mail.
  3. Publish DMARC p=reject.
  4. Optionally add an empty DKIM wildcard revocation.
  5. Scan free to verify.

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

parked.co.uk.        TXT "v=spf1 -all"
parked.co.uk.        MX  0 .
_dmarc.parked.co.uk. TXT "v=DMARC1; p=reject; sp=reject; adkim=s; aspf=s"

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: SPF, DMARC, MX.

Scan my domain free (20-check SuperTool) → £24 Sovereign DMARC (T0 RUA), SPF, MTA-STS & PHP2Shell Remediation 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

Do I need rua on parked domains?

Optional; it shows whether anyone is spoofing the domain.

Does this affect the website?

No — web (A/AAAA) records are separate.

Related FaultyPacket guides & tools

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