B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
85.7%
85.7% -- share of domains not enforcing dmarc policy for email sending domains (2026)
According to DMARC Checker adoption data, 85.7% of domains do not enforce DMARC with a quarantine or reject policy.
Attribution:
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
85.7%
Unit
Percentage
Data Vintage
2026
Entity
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
75
Source Trust
60
Citation Chain
60
Independence
30
Methodology
45
Freshness
95
Source
DMARC Checker
Primary
Tier B
https://e-warmup.com/blog/how-to-improve-email-deliverability-guide/ ↗
Source Article
How to Improve Email Deliverability Without Hurting Sender Reputation (2026 Guide)
Table of Contents
Nearly 88% of email senders cannot correctly define what “email delivery rate” even measures, according to Mailgun’s State of Email Deliverability 2025 report.
And yet, those same people are using it as their primary benchmark for campaign success. That’s a bit like a pilot checkin…
Original Research
DMARC Checker
· Original study ↗
Methodology
Cited from DMARC Checker adoption data; no specific year given, publication year used
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
email sending domains: 85.7% share of domains not enforcing dmarc policy. Source: DMARC Checker (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/domains-not-enforcing-dmarc
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<blockquote cite="https://lighthousedata.io/data/domains-not-enforcing-dmarc" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>85.7%</strong> -- share of domains not enforcing dmarc policy for email sending domains<br><small>Source: DMARC Checker (2026) · <a href="https://lighthousedata.io/data/domains-not-enforcing-dmarc" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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