By Cargo / Passengers
Passengers Carriers — Email Security
63.6% of active passengers carrier domains have no enforced DMARC — leaving 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, which is consequential — 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.