B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
54.4%
54.4% -- spf adoption rate for Domains ranked beyond 1M (Tranco) (2026-03)
Domains ranked beyond 1M in the Tranco list have an SPF adoption rate of 54.4%.
Attribution:
View source
Lighthouse Research Team
Last verified:
·
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Source verified
Evidence graded
Value
54.4%
Unit
Percentage
Data Vintage
2026-03
Entity
Sample Size
4,499,028
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
DMARCguard
Primary
Tier A
https://dmarcguard.io/research/spf-supply-chain/ ↗
Source Article
SPF Supply Chain 2026: Email Sender Market Share Across 5.5 Million Domains | DMARCguard
SPF Supply Chain 2026: Email Sender Market Share Across 5.5 Million Domains
Microsoft 365 powers 19.6% of SPF-enabled domains. First-ever email sender market share by SPF include, analyzing 3 million domains from Tranco Top Sites.
Study at a glance
Executive Summary
Microsoft 365 and Google Workspac…
Original Research
DMARCguard
· Original study ↗
Methodology
2,448,918 of 4,499,028 domains publish SPF
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
Domains ranked beyond 1M (Tranco): 54.4% spf adoption rate. Source: DMARCguard (2026-03). Via Lighthouse Intelligence -- https://lighthousedata.io/data/spf-adoption-long-tail-2026
HTML Embed
<blockquote cite="https://lighthousedata.io/data/spf-adoption-long-tail-2026" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>54.4%</strong> -- spf adoption rate for Domains ranked beyond 1M (Tranco)<br><small>Source: DMARCguard (2026-03) · <a href="https://lighthousedata.io/data/spf-adoption-long-tail-2026" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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