--- title: "Indiana Trucking Email Security — 76.3% lack DMARC | EFROS" description: "Email-security posture of 9,012 active motor carriers in Indiana. 76.3% of domains have no enforced DMARC, 9.3% use p=reject. Free, public, source-cited." canonical: https://efros.com/research/us-trucking-email-security-index/by-state/indiana/ --- - [Home](https://efros.com/) - /[Research](https://efros.com/research/) - /[US Trucking Email Security Index](https://efros.com/research/us-trucking-email-security-index/) - /[By State](https://efros.com/research/us-trucking-email-security-index/by-state/) - /Indiana By State / Indiana # Indiana Trucking Email Security **76.3%** of active carrier domains in Indiana have no enforced DMARC. That leaves freight operators open to email impersonation, payment-redirect fraud, and cargo theft via phishing. Edition: 2026-Q2 State rank: #17 Carriers: 9,012 Domains: 7,439 By [Stefan Efros](https://www.linkedin.com/in/stefanefros-cyberdefense/), CEO & Founder, EFROS Updated · May 19, 2026 No enforced DMARC 76.3% national: 80.1% p=reject 9.3% national: 7.5% Microsoft 365 40.0% national: 38.1% M365 + no DMARC (carriers) 2,195 national: 92,822 MTA-STS 3.8% national: 3.3% DNSSEC 5.7% national: 6.1% Dead domains 375 of 7,439 scanned Total carriers 9,012 376 with dead domain ## Risk bands — Indiana 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+ | 698 | 612 | | High | score 50–69 | 2,516 | 1,979 | | Medium | score 30–49 | 3,628 | 3,109 | | Low | score 15–29 | 1,693 | 1,297 | | Minimal | score ## Indiana vs. national average No enforced DMARC 76.3% vs 80.1% national p=reject adoption 9.3% vs 7.5% national MTA-STS 3.8% vs 3.3% national DNSSEC 5.7% vs 6.1% national ## What the Indiana numbers actually mean **DMARC posture.** Indiana's share of carrier domains with no enforced DMARC sits at **76.3%**, better than the national average by 3.8 points. Indiana carriers adopt the enforced p=reject DMARC policy at a meaningfully higher rate than the national pool. At the protective end of the distribution, 9.3% of Indiana domains are at p=reject, the only DMARC policy that actually instructs receivers to drop spoofed mail. **Microsoft 365 surface.** Microsoft 365 mailflow adoption is heavier than the national distribution. Every M365 tenant already includes the controls needed to enforce DMARC, so the 2,195 M365 carriers in Indiana with DMARC disabled are leaving paid-for protection switched off. That share is **24.4%** of all Indiana carriers — a one-flag-flip remediation set that any regional MSP or in-house IT lead can clear in a single quarter. **Transport encryption.** MTA-STS adoption sits at 3.8%, materially below the threshold a freight payment-redirect attacker would have to clear to be inconvenienced by transport-layer policy. DNSSEC adoption in Indiana runs at **5.7%** (vs 6.1% national), which matters for downstream DKIM and MTA-STS validation but is still a minority signal. **Risk-band shape.** Indiana's critical-band share is 7.7% versus 8.4% nationally, with the pressure shifting into the high band (27.9% of state carriers) where one or two control gaps still leave room for impersonation. The composite pain score blends SPF posture, DMARC enforcement, MTA-STS presence, and DNSSEC, so a carrier clusters in the critical band only when several controls fail together. Remediation that flips DMARC to enforcement plus turns on MTA-STS typically moves a carrier two bands down in one quarter. **What this means for buyers and shippers.** If you are dispatching freight, settling broker payments, or receiving rate confirmations from Indiana-based carriers, the operational exposure is the 76.3%of domains that cannot stop a stranger from sending email in the carrier's name. Payment-redirect and load-redirect fraud rides on exactly that gap. Verifying a counterparty's DMARC posture before a first wire (a 30-second DNS lookup) is the cheapest control in the freight stack. ## Compare Indiana with other states States closest in carrier-count rank to Indiana. Each is scored on the same DNS-derived control set, so the comparison is apples-to-apples. [### North Carolina Rank #1678.2% no DMARC · 9,256 carriers](https://efros.com/research/us-trucking-email-security-index/by-state/north-carolina/) [### Maryland Rank #1878.9% no DMARC · 7,970 carriers](https://efros.com/research/us-trucking-email-security-index/by-state/maryland/) [### New Jersey Rank #1578.8% no DMARC · 9,844 carriers](https://efros.com/research/us-trucking-email-security-index/by-state/new-jersey/) [### Kentucky Rank #1977.1% no DMARC · 6,201 carriers](https://efros.com/research/us-trucking-email-security-index/by-state/kentucky/) [### Colorado Rank #1479.0% no DMARC · 10,031 carriers](https://efros.com/research/us-trucking-email-security-index/by-state/colorado/) [← Full US Trucking Email Security Index](https://efros.com/research/us-trucking-email-security-index/) [← All states](https://efros.com/research/us-trucking-email-security-index/by-state/) [Switch to cargo-segment view →](https://efros.com/research/us-trucking-email-security-index/by-cargo/) ## 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 2026-05-20from public DNS measurements. Statistics are domain-weighted unless noted. State scope is the carrier's FMCSA-registered state. Methodology: [read the full index](https://efros.com/research/us-trucking-email-security-index/).