B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
2.7%
2.7% -- share of all domains with spf permerror trigger for Scanned domains (Tranco Top Sites) (2026)
2.7% of all 5,499,028 scanned domains from the Tranco Top Sites list had SPF configurations exceeding the 10-DNS-lookup limit.
Attribution:
View source
Lighthouse Research Team
Last verified:
·
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Source verified
Evidence graded
Value
2.7%
Unit
Percentage
Data Vintage
2026
Entity
Sample Size
5,499,028
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/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
DMARCguard
· Original study ↗
Methodology
DMARCguard SPF Supply Chain Study
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
Scanned domains (Tranco Top Sites): 2.7% share of all domains with spf permerror trigger. Source: DMARCguard (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/spf-permerror-rate-all-domains-2026
HTML Embed
<blockquote cite="https://lighthousedata.io/data/spf-permerror-rate-all-domains-2026" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>2.7%</strong> -- share of all domains with spf permerror trigger for Scanned domains (Tranco Top Sites)<br><small>Source: DMARCguard (2026) · <a href="https://lighthousedata.io/data/spf-permerror-rate-all-domains-2026" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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