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.
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 <15 | 98 | 90 |
Passengers vs. national average
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.
See where your own domain stands
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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.