---
title: "Building Materials Carriers — Email Security Posture | EFROS"
description: "Email-security posture of 87,015 active Building Materials motor carriers. 79.6% of domains have no enforced DMARC, 7.7% use p=reject. Free, public, source-cited."
canonical: https://efros.com/research/us-trucking-email-security-index/by-cargo/building-materials/
---

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- /Building Materials

By Cargo / Building Materials

# Building Materials Carriers — Email Security

**79.6%** of active building 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: #2 Carriers: 87,015 Domains: 76,690

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

Updated · May 19, 2026

No enforced DMARC

79.6%

national: 80.1%

p=reject

7.7%

national: 7.5%

Microsoft 365

40.0%

national: 38.1%

M365 + no DMARC (carriers)

22,333

national: 92,822

MTA-STS

3.5%

national: 3.3%

DNSSEC

5.2%

national: 6.1%

Dead domains

4,635

of 76,690 scanned

Total carriers

87,015

4,636 with dead domain

## Risk bands — Building 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+ | 7,536 | 6,812 |
| High | score 50–69 | 24,575 | 22,032 |
| Medium | score 30–49 | 35,629 | 31,290 |
| Low | score 15–29 | 13,921 | 11,374 |
| Minimal | score

## Building Materials vs. national average

No enforced DMARC 79.6% vs 80.1% national

p=reject adoption 7.7% vs 7.5% national

MTA-STS 3.5% vs 3.3% national

DNSSEC 5.2% vs 6.1% national

## What the Building Materials numbers actually mean

**Segment exposure framing.** Building materials moves on contractor and developer timelines where one missed delivery cascades into job-site scheduling penalties. Attackers know that pressure and use it to get fraudulent rate confirmations approved.

**DMARC posture.** The building materialssegment's share of carrier domains with no enforced DMARC sits at **79.6%**, within 0.5 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, 7.7% 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 22,333 M365 carriers in this segment with DMARC disabled are leaving paid-for protection switched off. That share is **25.7%** of all building 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 3.5%, materially below the threshold a freight payment-redirect attacker would have to clear to be inconvenienced by transport-layer policy. DNSSEC adoption across building materials carriers runs at **5.2%** (vs 6.1% national).

**Risk-band shape.** Building Materials's critical and high bands combine to 36.9% of segment carriers, close to the national distribution, so remediation prioritization here should follow the same shape as the national program.

**Best-practice control for this segment.** Contractors and material wholesalers should run a DMARC check on every new carrier domain before publishing the first BOL.

## Compare Building Materials with other cargo segments

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

[### General Freight Rank #180.6% no DMARC · 169,977 carriers](https://efros.com/research/us-trucking-email-security-index/by-cargo/general-freight/) [### Large Machinery Rank #378.1% no DMARC · 70,561 carriers](https://efros.com/research/us-trucking-email-security-index/by-cargo/machinery/) [### Hazardous Materials Rank #474.6% no DMARC · 45,574 carriers](https://efros.com/research/us-trucking-email-security-index/by-cargo/hazmat/) [### Grain / Feed Rank #579.1% no DMARC · 26,271 carriers](https://efros.com/research/us-trucking-email-security-index/by-cargo/grain-feed/) [### Motor Vehicles Rank #680.2% no DMARC · 22,079 carriers](https://efros.com/research/us-trucking-email-security-index/by-cargo/motor-vehicles/)

[← 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/).