B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
37%
37% -- return on investment increase for marketers who regularly A/B test emails (2026)
Marketers who regularly A/B test emails see 37% higher returns compared to those who do not.
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
37%
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
50
Citation Chain
20
Independence
30
Methodology
45
Freshness
86
Source
Invesp
Primary
Tier A
https://salesso.com/blog/how-to-add-columns-in-mailchimp-final/ ↗
Source Article
How to Add Columns in Mailchimp - Sales So
How to Add Columns in Mailchimp
- Protected_User_4eaaaa7b
- Views : 28,543
Table of Contents
Most people open Mailchimp, stare at the blank canvas, and paste in a wall of text.
Then they wonder why nobody clicks.
The fix is simpler than you think — columns. A well-structured multi-column layout make…
Original Research
Invesp
· Original study ↗
Methodology
Invesp
Methodology documented
Segmentation
Channelrss_feed
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Plain Text
marketers who regularly A/B test emails: 37% return on investment increase. Source: Invesp (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/ab-testing-email-returns
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<blockquote cite="https://lighthousedata.io/data/ab-testing-email-returns" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>37%</strong> -- return on investment increase for marketers who regularly A/B test emails<br><small>Source: Invesp (2026) · <a href="https://lighthousedata.io/data/ab-testing-email-returns" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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