--- title: "Passengers Carriers — Email Security Posture | EFROS" description: "Email-security posture of 6,508 active Passengers motor carriers. 63.6% of domains have no enforced DMARC, 16.0% use p=reject. Free, public, source-cited." canonical: https://efros.com/research/us-trucking-email-security-index/by-cargo/passengers/ --- - [Home](https://efros.com/) - /[Research](https://efros.com/research/) - /[US Trucking Email Security Index](https://efros.com/research/us-trucking-email-security-index/) - /[By Cargo](https://efros.com/research/us-trucking-email-security-index/by-cargo/) - /Passengers By Cargo / Passengers # Passengers Carriers — Email Security **63.6%** of active passengers 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: #14 Carriers: 6,508 Domains: 5,214 By [Stefan Efros](https://www.linkedin.com/in/stefanefros-cyberdefense/), CEO & Founder, EFROS Updated · May 19, 2026 No enforced DMARC 63.6% national: 80.1% p=reject 16.0% national: 7.5% Microsoft 365 39.9% national: 38.1% M365 + no DMARC (carriers) 1,245 national: 92,822 MTA-STS 6.1% national: 3.3% DNSSEC 5.0% national: 6.1% Dead domains 233 of 5,214 scanned Total carriers 6,508 234 with dead domain ## Risk bands — Passengers 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+ | 417 | 343 | | High | score 50–69 | 1,267 | 1,046 | | Medium | score 30–49 | 2,556 | 2,116 | | Low | score 15–29 | 1,936 | 1,386 | | Minimal | score ## Passengers vs. national average No enforced DMARC 63.6% vs 80.1% national p=reject adoption 16.0% vs 7.5% national MTA-STS 6.1% vs 3.3% national DNSSEC 5.0% vs 6.1% national ## What the Passengers numbers actually mean **Segment exposure framing.** Passenger carriers (motorcoach, charter) handle direct consumer bookings and group-event coordination — a fraudulent booking-confirmation email can move a deposit to an attacker before the consumer realizes the impersonation. **DMARC posture.** The passengerssegment's share of carrier domains with no enforced DMARC sits at **63.6%**, better than the national average by 16.5 points. Passengers carriers adopt enforced p=reject DMARC at a meaningfully higher rate than the national pool. At the protective end of the distribution, 16.0% 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 1,245 M365 carriers in this segment with DMARC disabled are leaving paid-for protection switched off. That share is **19.1%** of all passengers 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 (the encrypted-transport policy that prevents DNS-downgrade interception) runs above the national rate, but the absolute floor is still under 11%, well short of where freight payment flows should sit. DNSSEC adoption across passengers carriers runs at **5.0%** (vs 6.1% national). **Risk-band shape.** Passengers's critical-band share is 6.4% versus 8.4% nationally, with the pressure shifting into the high band (19.5% of segment carriers) where one or two control gaps still leave room for impersonation. **Best-practice control for this segment.** Group travel buyers should verify carrier DMARC posture as part of any deposit authorization and treat low DMARC scores as a vendor due-diligence signal. ## Compare Passengers with other cargo segments Segments closest in carrier-count rank to Passengers. Each is scored on the same DNS-derived control set, so the comparison is apples-to-apples. [### Livestock Rank #1376.9% no DMARC · 7,958 carriers](https://efros.com/research/us-trucking-email-security-index/by-cargo/livestock/) [### Oilfield Equipment Rank #1277.1% no DMARC · 8,085 carriers](https://efros.com/research/us-trucking-email-security-index/by-cargo/oilfield/) [### Intermodal Containers Rank #1179.5% no DMARC · 9,463 carriers](https://efros.com/research/us-trucking-email-security-index/by-cargo/intermodal/) [### Chemicals Rank #1068.8% no DMARC · 9,577 carriers](https://efros.com/research/us-trucking-email-security-index/by-cargo/chemicals/) [### Refrigerated / Cold Chain Rank #978.1% no DMARC · 16,211 carriers](https://efros.com/research/us-trucking-email-security-index/by-cargo/refrigerated/) [← 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/).