B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Recent
15%
15% -- performance gap vs human copy for Fully AI-generated campaign emails (2025)
Generating an entire email campaign from scratch with AI underperforms human/assisted copy by 15-25%.
- Based on internal agency testing across campaigns
Attribution:
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
15%
Unit
Percentage
Data Vintage
2025
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
Excelsior Hunt (excelohunt.com)
Primary
Tier B
https://www.excelohunt.com/blog/ai-email-marketing-ecommerce/ ↗
Source Article
AI in Email Marketing: Practical Applications for E-Commerce Brands in 2025
AI in Email Marketing: Practical Applications for E-Commerce Brands in 2025
Everyone is talking about AI in email marketing. Most of them are selling you hype. “AI will write all your emails!” “AI will replace your marketing team!” “AI-powered 10x revenue growth!”
Here’s the reality: AI is a tool, n…
Original Research
Excelsior Hunt (excelohunt.com)
· Original study ↗
Methodology
Vendor's own testing; range midpoint reported
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
Fully AI-generated campaign emails: 15% performance gap vs human copy. Source: Excelsior Hunt (excelohunt.com) (2025). Via Lighthouse Intelligence -- https://lighthousedata.io/data/ai-full-campaign-underperformance
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<blockquote cite="https://lighthousedata.io/data/ai-full-campaign-underperformance" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>15%</strong> -- performance gap vs human copy for Fully AI-generated campaign emails<br><small>Source: Excelsior Hunt (excelohunt.com) (2025) · <a href="https://lighthousedata.io/data/ai-full-campaign-underperformance" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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