B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
20%
20% -- optimal email personalization level for sales emails (2026)
Research indicates that approximately 20% customization is the optimal level of personalization for sales emails.
- Approximation stated in text ('approximately 20%')
- Specific underlying study methodology and sample size not detailed in text
Attribution:
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
20%
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
Medium
Primary
Tier C
https://www.antoinebuteau.com/lessons-from-kyle-porter/ ↗
Source Article
Lessons from Kyle Porter
Original Research
Medium
· Original study ↗
Methodology
Cited as 'research' via Medium; original study not identified
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
sales emails: 20% optimal email personalization level. Source: Medium (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/sales-email-personalization-optimal-20
HTML Embed
<blockquote cite="https://lighthousedata.io/data/sales-email-personalization-optimal-20" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>20%</strong> -- optimal email personalization level for sales emails<br><small>Source: Medium (2026) · <a href="https://lighthousedata.io/data/sales-email-personalization-optimal-20" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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