By Cargo / Building Materials
Building Materials Carriers — Email Security
79.6% of active building materials carrier domains have no enforced DMARC — leaving this segment open to email impersonation, payment-redirect fraud, and cargo theft via phishing.
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 <15 | 718 | 547 |
Building Materials vs. national average
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 — meaning 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, which is consequential — 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, meaning 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.
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.
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.