Topic starter
25/10/2026 10:59 am
TL;DR: Most Heartland domains have not reached DMARC enforcement, and Red Sift says the biggest gap is the large share still stuck in report-only or quarantine states. Email identity controls stay weak until domains move from monitoring to reject, so spoofed mail can still reach inboxes.
Editorial analysis by NHI Mgmt Group, based on content published by Red Sift: “64% of U.S. Heartland organizations exposed to email spoofing”.
By the numbers:
- Only 328 of 900 domains across nine Heartland states have reached full DMARC enforcement.
- 287 domains, or 31.9%, run p=none policies that monitor but take no action against spoofed emails.
- 202 domains, or 22.4%, sit at p=quarantine, close to full protection but not finishing the move to reject.
Key questions
Q: When should organisations prioritise DMARC over more user-awareness training?
A: Prioritise DMARC when spoofed mail, brand impersonation, or executive lookalike abuse is a recurring risk.
Q: What are the signs that a DMARC rollout is failing in practice?
A: The clearest signs are legitimate messages being rejected, deliverability complaints from customers or partners, and unresolved alignment issues with third-party senders.
Q: What breaks when DMARC stays at monitoring mode?
A: When DMARC remains at p=none, the organisation gains visibility but not protection.
Practitioner guidance
- Enforce DMARC on business-critical domains Move domains that support payments, procurement, contracts, and partner communication to p=reject once legitimate sender inventory is validated.
- Inventory every authorised sender Map all systems, vendors, and platforms that send on behalf of your domains so SPF and DKIM alignment can be maintained without accidental breakage.
- Retire long-running p=none policies Set a deadline for report-only records and assign owners to each domain that still monitors spoofing without blocking it.
Bottom line: Most Heartland organisations have not yet reached DMARC enforcement, which leaves spoofed email usable against sectors that rely heavily on trusted messaging.
Glossary terms: DMARC, Email Spoofing, Report-Only Enforcement, Sender Inventory
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This topic was modified 7 days ago by NHI Mgmt Group
27/10/2026 7:15 pm
DMARC enforcement is now a trust-control problem, not a messaging preference. The Heartland data shows that organisations still treat policy levels as optional maturity steps rather than as a boundary between monitored risk and blocked impersonation. In sectors where email drives payment and operational authorisation, that assumption no longer holds. Practitioners should treat domain enforcement as part of identity trust governance, not as a mail-team optimisation.
A question worth separating out:
Q: Who should own DMARC enforcement in an organisation?
A: DMARC enforcement should be jointly owned by security and the teams operating domain-based mail services. Security should define the policy and monitoring expectations, while platform or messaging teams validate legitimate senders and fix alignment issues. That split keeps deliverability, fraud prevention, and change control tied to one operating model.
👉 Read our full editorial: Heartland critical infrastructure still lags on DMARC enforcement
This post was modified 7 days ago by NHI Mgmt Group