B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
148,655
148,655 -- count of domains with effectively broken spf for Tranco SPF-enabled domains (2026-02)
In a February 2026 scan of 5.5 million Tranco domains, 148,655 SPF-enabled domains exceeded the 10-lookup limit, making their SPF effectively broken.
Attribution:
View source
Lighthouse Research Team
Last verified:
·
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Source verified
Evidence graded
Value
148,655
Unit
Count
Data Vintage
2026-02
Entity
Sample Size
3,077,219
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/dmarc-failed-how-to-fix/ ↗
Source Article
DMARC Fail: 7 Causes & How to Fix Each (2026 Guide) | DMARCguard
DMARC Fail: 7 Causes & How to Fix Each (2026 Guide)
DMARC failures bounce or junk legitimate email — and 9 out of 10 are caused by SPF/DKIM misalignment, third-party senders, or email forwarding. Below, walk through each cause, diagnose which one hit your domain, and fix it today. For a fast, automa…
Original Research
DMARCguard
· Original study ↗
Methodology
DMARCguard Scanner domain scan
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
Tranco SPF-enabled domains: 148,655 count of domains with effectively broken spf. Source: DMARCguard (2026-02). Via Lighthouse Intelligence -- https://lighthousedata.io/data/spf-broken-domains-count-2026
HTML Embed
<blockquote cite="https://lighthousedata.io/data/spf-broken-domains-count-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> -- count of domains with effectively broken spf for Tranco SPF-enabled domains<br><small>Source: DMARCguard (2026-02) · <a href="https://lighthousedata.io/data/spf-broken-domains-count-2026" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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