B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
83.4%
83.4% -- spf adoption rate for commercially-mailed domains (2026-08)
83.4% of commercially-mailed domains publish an SPF record.
- Sample over-represents B2B and commercially-mailed domains rather than a random DNS sample.
Attribution:
View source
Lighthouse Research Team
Last verified:
·
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Source verified
Evidence graded
Value
83.4%
Unit
Percentage
Data Vintage
2026-08
Entity
Sample Size
272,446
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
95
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
bouncezero.io
Primary
Tier A
https://bouncezero.io/inbox-infrastructure-report-2026 ↗
Source Article
The Inbox Infrastructure Report 2026 - a 272,446-Domain Email Authentication Census | BounceZero Research
BounceZero Research - Flagship Report
What 272,446 domains reveal about the state of email authentication. Snapshot, August 2026 - every claim below is independently verifiable with dig
.
By Ayoub Lebda, Founder
|August 2026
|Data: 2026-02-15 > 2026-08-05
Sample frame, stated plainly: these are doma…
Original Research
bouncezero.io
· Original study ↗
Methodology
Domains publishing SPF records
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
commercially-mailed domains: 83.4% spf adoption rate. Source: bouncezero.io (2026-08). Via Lighthouse Intelligence -- https://lighthousedata.io/data/spf-adoption-2026
HTML Embed
<blockquote cite="https://lighthousedata.io/data/spf-adoption-2026" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>83.4%</strong> -- spf adoption rate for commercially-mailed domains<br><small>Source: bouncezero.io (2026-08) · <a href="https://lighthousedata.io/data/spf-adoption-2026" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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