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

DMARC Quarantine vs Reject: Which Policy Should You Use?

The short answer (what's causing it)

p=quarantine asks receivers to treat failing mail as suspicious (usually spam folder); p=reject asks them to refuse it at SMTP. Both only apply to mail that fails aligned SPF and DKIM.

Step-by-step fix

  1. Check your current policy with the free scan.
  2. Use quarantine as the staging step while confirming no legitimate source fails.
  3. Switch to reject once reports are clean.
  4. Set sp= if subdomains need a different policy.

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

_dmarc.example.co.uk. TXT "v=DMARC1; p=reject; sp=reject; rua=mailto:[email protected]"

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: DMARC.

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

Is reject riskier?

Only for mis-configured legitimate senders; that's why you stage it.

Does pct work with reject?

Yes, pct applies a partial rollout; failing mail outside pct falls back to the next-weaker policy.

Related FaultyPacket guides & tools

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