B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
13.5%
13.5% -- positive perception increase for email senders using exclamation points (2026)
Using exclamation points in emails can lead people to perceive the sender up to 13.5% more positively.
- Applies to using exclamation points to look friendly, but not assertive
Attribution:
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
13.5%
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
75
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
Science Says
Primary
Tier B
https://app.sciencesays.com/t/B2B ↗
Source Article
Science Says
Original Research
Science Says
· Original study ↗
Methodology
Aggregated behavioral research finding, upper bound reported
Methodology documented
Segmentation
Industrymarketing
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Plain Text
email senders using exclamation points: 13.5% positive perception increase. Source: Science Says (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/exclamation-points-email-perception
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<blockquote cite="https://lighthousedata.io/data/exclamation-points-email-perception" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>13.5%</strong> -- positive perception increase for email senders using exclamation points<br><small>Source: Science Says (2026) · <a href="https://lighthousedata.io/data/exclamation-points-email-perception" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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