B
Evidence Grade B
Safe to Cite
Current
1%
1% -- complaint rate for email senders (2026)
Attribution:
View source
Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
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
95
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
Prospeo
Primary
Tier A
https://prospeo.io/s/what-is-a-good-sender-score ↗
Source Article
What Is a Good Sender Score? Ranges & Fixes (2026)
What Is a Good Sender Score? Ranges & Fixes (2026)
A good sender score is above 80. Scores of 90+ correlate with complaint rates below 1% and typically strong inbox placement. Between 70 and 79, you're in warning territory. Drop below 70 and you'll start seeing throttling and spam folder placement a…
Original Research
Prospeo
· Original study ↗
Methodology
Scores of 90+ correlate with complaint rates below 1%.
Segmentation
Industryemail_marketing
RoleAll marketers
Channelemail
Cite this stat
Plain Text
email senders: 1% complaint rate. Source: Prospeo (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/sender_score_complaint_rate
HTML Embed
<blockquote cite="https://lighthousedata.io/data/sender_score_complaint_rate" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>1%</strong> -- complaint rate for email senders<br><small>Source: Prospeo (2026) · <a href="https://lighthousedata.io/data/sender_score_complaint_rate" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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