---
title: "Motor Vehicles Carriers — Email Security Posture | EFROS"
description: "Email-security posture of 22,079 active Motor Vehicles motor carriers. 80.2% of domains have no enforced DMARC, 8.1% use p=reject. Free, public, source-cited."
canonical: https://efros.com/research/us-trucking-email-security-index/by-cargo/motor-vehicles/
---

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- /Motor Vehicles

By Cargo / Motor Vehicles

# Motor Vehicles Carriers — Email Security

**80.2%** of active motor vehicles 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: #6 Carriers: 22,079 Domains: 19,156

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

Updated · May 19, 2026

No enforced DMARC

80.2%

national: 80.1%

p=reject

8.1%

national: 7.5%

Microsoft 365

34.7%

national: 38.1%

M365 + no DMARC (carriers)

4,811

national: 92,822

MTA-STS

3.9%

national: 3.3%

DNSSEC

6.4%

national: 6.1%

Dead domains

1,417

of 19,156 scanned

Total carriers

22,079

1,419 with dead domain

## Risk bands — Motor Vehicles 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+ | 2,054 | 1,835 |
| High | score 50–69 | 6,526 | 5,693 |
| Medium | score 30–49 | 8,597 | 7,418 |
| Low | score 15–29 | 3,307 | 2,645 |
| Minimal | score

## Motor Vehicles vs. national average

No enforced DMARC 80.2% vs 80.1% national

p=reject adoption 8.1% vs 7.5% national

MTA-STS 3.9% vs 3.3% national

DNSSEC 6.4% vs 6.1% national

## What the Motor Vehicles numbers actually mean

**Segment exposure framing.** Motor-vehicle transport (auto haulers, dealer movements) has high per-unit value and a small attacker margin per attempt — attractive for targeted payment-redirect campaigns against dealer payment ops.

**DMARC posture.** The motor vehiclessegment's share of carrier domains with no enforced DMARC sits at **80.2%**, within 0.1 points of the national average. enforced p=reject DMARC adoption tracks the national pool: most domains in this segment either have no DMARC at all or are stuck at the monitor-only p=none policy. At the protective end of the distribution, 8.1% 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 sits below the national rate, which shifts the remediation surface toward self-hosted and Google Workspace estates where DMARC has to be configured at the DNS layer rather than flipped on in a tenant policy. That share is **21.8%** of all motor vehicles 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 3.9%, materially below the threshold a freight payment-redirect attacker would have to clear to be inconvenienced by transport-layer policy. DNSSEC adoption across motor vehicles carriers runs at **6.4%** (vs 6.1% national).

**Risk-band shape.** 9.3% of Motor Vehicles carriers sit in the critical risk band (score 70+), above the national share of 8.4%. A disproportionate cluster carries simultaneously broken SPF, missing or monitor-only DMARC, and no MTA-STS.

**Best-practice control for this segment.** Dealer groups dispatching new-car deliveries should require DMARC enforcement on every carrier counterparty and verify any banking-detail change via a callback to a known-good number.

## Compare Motor Vehicles with other cargo segments

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

[### Grain / Feed Rank #579.1% no DMARC · 26,271 carriers](https://efros.com/research/us-trucking-email-security-index/by-cargo/grain-feed/) [### Household Goods Rank #781.6% no DMARC · 17,343 carriers](https://efros.com/research/us-trucking-email-security-index/by-cargo/household-goods/) [### Hazardous Materials Rank #474.6% no DMARC · 45,574 carriers](https://efros.com/research/us-trucking-email-security-index/by-cargo/hazmat/) [### Liquids / Gas (Tanker) Rank #870.9% no DMARC · 16,694 carriers](https://efros.com/research/us-trucking-email-security-index/by-cargo/tanker-liquids-gas/) [### Large Machinery Rank #378.1% no DMARC · 70,561 carriers](https://efros.com/research/us-trucking-email-security-index/by-cargo/machinery/)

[← 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/).