---
title: "Hazardous Materials Carriers — Email Security Posture | EFROS"
description: "Email-security posture of 45,574 active Hazardous Materials motor carriers. 74.6% of domains have no enforced DMARC, 10.3% use p=reject. Free, public, source-cited."
canonical: https://efros.com/research/us-trucking-email-security-index/by-cargo/hazmat/
---

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- /Hazardous Materials

By Cargo / Hazardous Materials

# Hazardous Materials Carriers — Email Security

**74.6%** of active hazardous materials carrier domains have no enforced DMARC. That leaves this segment open to email impersonation, payment-redirect fraud, and cargo theft via phishing.

Edition: 2026-Q2 Segment rank: #4 Carriers: 45,574 Domains: 39,674

By [Stefan Efros](https://www.linkedin.com/in/stefanefros-cyberdefense/), CEO & Founder, EFROS

Updated · May 19, 2026

No enforced DMARC

74.6%

national: 80.1%

p=reject

10.3%

national: 7.5%

Microsoft 365

41.9%

national: 38.1%

M365 + no DMARC (carriers)

11,723

national: 92,822

MTA-STS

3.8%

national: 3.3%

DNSSEC

5.6%

national: 6.1%

Dead domains

1,580

of 39,674 scanned

Total carriers

45,574

1,581 with dead domain

## Risk bands — Hazardous Materials carriers

Carrier counts by risk band (composite email-security pain score). Critical = score 70+; Minimal = score <15.

| Risk band | Score range | Carriers | Domains |
| --- | --- | --- | --- |
| Critical | score 70+ | 2,896 | 2,736 |
| High | score 50–69 | 11,902 | 10,720 |
| Medium | score 30–49 | 19,071 | 16,644 |
| Low | score 15–29 | 9,577 | 7,552 |
| Minimal | score

## Hazardous Materials vs. national average

No enforced DMARC 74.6% vs 80.1% national

p=reject adoption 10.3% vs 7.5% national

MTA-STS 3.8% vs 3.3% national

DNSSEC 5.6% vs 6.1% national

## What the Hazardous Materials numbers actually mean

**Segment exposure framing.** Hazmat carriers operate under heavier regulatory oversight (HMR, USDOT, PHMSA), but the email-security posture sits in the same range as the rest of the industry, so an impersonated dispatch instruction could route hazardous cargo to an unauthorized destination.

**DMARC posture.** The hazardous materialssegment's share of carrier domains with no enforced DMARC sits at **74.6%**, better than the national average by 5.5 points. Hazardous Materials carriers adopt enforced p=reject DMARC at a meaningfully higher rate than the national pool. At the protective end of the distribution, 10.3% of segment domains are at p=reject, the only DMARC policy that actually instructs receivers to drop spoofed mail.

**Microsoft 365 surface.** Microsoft 365 mailflow adoption runs heavier than the national distribution. Every M365 tenant already includes the controls needed to enforce DMARC, so the 11,723 M365 carriers in this segment with DMARC disabled are leaving paid-for protection switched off. That share is **25.7%** of all hazardous materials carriers — a one-flag-flip remediation set that segment-specific MSPs can clear in a single quarter without touching DNS infrastructure.

**Transport encryption.** MTA-STS adoption sits at 3.8%, materially below the threshold a freight payment-redirect attacker would have to clear to be inconvenienced by transport-layer policy. DNSSEC adoption across hazardous materials carriers runs at **5.6%** (vs 6.1% national).

**Risk-band shape.** Hazardous Materials's critical-band share is 6.4% versus 8.4% nationally, with the pressure shifting into the high band (26.1% of segment carriers) where one or two control gaps still leave room for impersonation.

**Best-practice control for this segment.** For hazmat shippers and brokers, treat DMARC enforcement as a regulatory-defensibility control alongside placarding and routing compliance — both protect chain-of-custody integrity.

## Compare Hazardous Materials with other cargo segments

Segments closest in carrier-count rank to Hazardous Materials. Each is scored on the same DNS-derived control set, so the comparison is apples-to-apples.

[### Large Machinery Rank #378.1% no DMARC · 70,561 carriers](https://efros.com/research/us-trucking-email-security-index/by-cargo/machinery/) [### Grain / Feed Rank #579.1% no DMARC · 26,271 carriers](https://efros.com/research/us-trucking-email-security-index/by-cargo/grain-feed/) [### Building Materials Rank #279.6% no DMARC · 87,015 carriers](https://efros.com/research/us-trucking-email-security-index/by-cargo/building-materials/) [### Motor Vehicles Rank #680.2% no DMARC · 22,079 carriers](https://efros.com/research/us-trucking-email-security-index/by-cargo/motor-vehicles/) [### General Freight Rank #180.6% no DMARC · 169,977 carriers](https://efros.com/research/us-trucking-email-security-index/by-cargo/general-freight/)

[← Full US Trucking Email Security Index](https://efros.com/research/us-trucking-email-security-index/) [← All cargo types](https://efros.com/research/us-trucking-email-security-index/by-cargo/) [Switch to state view →](https://efros.com/research/us-trucking-email-security-index/by-state/)

## See where your own domain stands

The research is free and self-serve. Run the same public checks on your own domain in about a minute — SPF, DKIM, DMARC, MTA-STS, DNSSEC, and more — and get a scored report by email. No agents, no credentials.

[Scan your domain free →](https://efros.com/tools/security-scan/) [Email security for fleets](https://efros.com/industries/trucking-company-msp/) [Talk to EFROS](https://efros.com/contact/?source=trucking-email-research)

Data as of 2026-05-20 from public DNS measurements. Statistics are domain-weighted unless noted. Cargo segment membership is based on FMCSA Company Census cargo flags. Methodology: [read the full index](https://efros.com/research/us-trucking-email-security-index/).