B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
0.1%
0.1% -- email complaint rate threshold for Email senders (deliverability best practice) (2026)
Email sender best practice recommendation for complaint rate threshold is under 0.1%.
Attribution:
View source
Lighthouse Research Team
Last verified:
·
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Source verified
Evidence graded
Value
0.1%
Unit
Percentage
Data Vintage
2026
Entity
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
50
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
listclean.xyz
Primary
Tier C
https://listclean.xyz/what-is-email-spam/ ↗
Source Article
Email Spam Explained: Why Emails Go to Spam & How to Fix It (2026 Master Guide)
Introduction
Email spam isn’t just an inbox annoyance — it’s a multi-billion-dollar problem that impacts sender reputation, data security, inbox placement, and ultimately business revenue. Whether it’s deceptive phishing campaigns, unsolicited promotional blasts, or bot-driven spam floods, understan…
Original Research
listclean.xyz
· Original study ↗
Methodology
Stated as a general sender benchmark in the guide's 2026-ready best-practices checklist; distinct from the stricter-attributed Gmail/Yahoo 0.3% spam-rate threshold. No specific attributing organization named in the source.
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
Email senders (deliverability best practice): 0.1% email complaint rate threshold. Source: listclean.xyz (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/email-complaint-rate-best-practice-threshold
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<blockquote cite="https://lighthousedata.io/data/email-complaint-rate-best-practice-threshold" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>0.1%</strong> -- email complaint rate threshold for Email senders (deliverability best practice)<br><small>Source: listclean.xyz (2026) · <a href="https://lighthousedata.io/data/email-complaint-rate-best-practice-threshold" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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