🚨 DMARC + PCI DSS 4.0.1 = A Compliance Shift You Can’t Ignore 🚨

Heads up, team!

If you’re a merchant, service provider, or anyone handling cardholder data, this update is 🔥.

PCI DSS 4.0.1 is here—and it's not just a patch. It’s a signal.

For the first time, DMARC (Domain-based Message Authentication, Reporting & Conformance) has made it into the PCI DSS glossary. That’s not a random footnote—it’s a clue about where compliance is headed:

➡️ Email threats are now a compliance concern, not just a security best practice.

Here’s why this matters:

Phishing is still the #1 way criminals breach systems.
PCI DSS 4.0.1 is making it clear: You can’t protect cardholder data if you don’t protect your domain.
DMARC (plus SPF & DKIM) builds a “proof-of-origin” for your email—so attackers can’t spoof your domain and trick customers or suppliers.

🔐 What to do now: If you haven’t deployed DMARC with enforcement, now’s the time. Start with:

SPF/DKIM aligned
Monitor-only DMARC
Gradually enforce (quarantine > reject)

Let this update be your nudge to take action before auditors make it mandatory.

📥 I’ve broken this down in a quick guide on the blog: 👉 How DMARC Fits Into PCI DSS 4.0.1

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