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 5,102,611+ 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

DKIM Fail: "Body Hash Did Not Verify" — What Causes It and How to Fix It

The short answer (what's causing it)

The receiver recomputed the hash of the message body and it no longer matched the signature. Something modified the body after signing: a mail gateway disclaimer, a mailing list footer, link rewriting, or line-ending changes.

Step-by-step fix

  1. Identify which hop modified the message (compare Received: headers).
  2. Move disclaimers/footers so they're added before DKIM signing, or have the gateway re-sign.
  3. For mailing lists/forwarders, rely on ARC or aligned SPF where possible.
  4. Re-test and confirm dkim=pass.

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

Authentication-Results: dkim=fail (body hash did not verify) header.d=example.co.uk

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: DKIM, 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 my DKIM key broken?

Usually not — a broken key gives a signature/key error, not a body hash mismatch.

Will DMARC still pass?

Only if aligned SPF passes for that hop.

Related FaultyPacket guides & tools

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