B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Aging
2%
2% -- share of domains with invalid spf for Top 1 million domains (2024)
Approximately 2% of the top 1 million domains had invalid SPF setups in 2024.
- approximate figure
Attribution:
View source
Lighthouse Research Team
Last verified:
·
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Source verified
Evidence graded
Value
2%
Unit
Percentage
Data Vintage
2024
Entity
Sample Size
1,000,000
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
20
Independence
30
Methodology
45
Freshness
95
Source
DMARC Checker / Wulfsoft
Primary
Tier B
https://dmarcguard.io/blog/spf-permerror-fix/ ↗
Source Article
SPF PermError: How to Find and Fix It (2026 Guide) | DMARCguard
SPF PermError: What Causes It and How to Fix It Step-by-Step
In our SPF Supply Chain Study, we scanned 5,499,028 domains and found 148,655 with SPF configurations that exceed the 10-lookup limit — the most common trigger for SPF PermError. If your emails are silently failing authentication, an inval…
Original Research
DMARC Checker / Wulfsoft
· Original study ↗
Methodology
Independent analysis of top 1 million domains
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
Top 1 million domains: 2% share of domains with invalid spf. Source: DMARC Checker / Wulfsoft (2024). Via Lighthouse Intelligence -- https://lighthousedata.io/data/invalid-spf-top-1m-domains-2024
HTML Embed
<blockquote cite="https://lighthousedata.io/data/invalid-spf-top-1m-domains-2024" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>2%</strong> -- share of domains with invalid spf for Top 1 million domains<br><small>Source: DMARC Checker / Wulfsoft (2024) · <a href="https://lighthousedata.io/data/invalid-spf-top-1m-domains-2024" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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