B
Evidence Grade B
Graded
under review
Safe to Cite
Current
80%
80% -- single opt in roi vs double opt in for Single opt-in email lists (2026)
Attribution:
View source
Lighthouse Research Team
Last verified:
·
How we verify data →
Source verified
Evidence graded
Value
80%
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
90
Citation Chain
90
Independence
30
Methodology
60
Freshness
95
Source
Litmus
Primary
Tier C
https://www.semrush.com/blog/greet-your-new-subscribers-with-engaging-welcome-emails/ ↗
Source Article
Greet Your New Subscribers with Engaging Welcome Emails
Original Research
Litmus
· Original study ↗
Methodology
Litmus study comparing SOI vs DOI email ROI
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
Single opt-in email lists: 80% single opt in roi vs double opt in. Source: Litmus (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/soi-roi-80-higher-than-doi
HTML Embed
<blockquote cite="https://lighthousedata.io/data/soi-roi-80-higher-than-doi" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>80%</strong> -- single opt in roi vs double opt in for Single opt-in email lists<br><small>Source: Litmus (2026) · <a href="https://lighthousedata.io/data/soi-roi-80-higher-than-doi" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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