B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
148,655
148,655 -- domains with spf exceeding 10 lookup limit for SPF-enabled domains (2026)
Of 3,077,219 domains with valid SPF records analyzed in the SPF Supply Chain Study, 148,655 exceeded the 10-DNS-lookup limit.
Attribution:
View source
Lighthouse Research Team
Last verified:
·
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Source verified
Evidence graded
Value
148,655
Unit
Count
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
SPF Supply Chain Study scanned 5,499,028 domains from Tranco Top Sites list, walking every SPF include chain
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
SPF-enabled domains: 148,655 domains with spf exceeding 10 lookup limit. Source: DMARCguard (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/spf-domains-exceeding-lookup-limit-2026
HTML Embed
<blockquote cite="https://lighthousedata.io/data/spf-domains-exceeding-lookup-limit-2026" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>148,655</strong> -- domains with spf exceeding 10 lookup limit for SPF-enabled domains<br><small>Source: DMARCguard (2026) · <a href="https://lighthousedata.io/data/spf-domains-exceeding-lookup-limit-2026" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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