B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
79%
79% -- email inbox delivery rate for marketing emails worldwide (2026)
According to a study by Return Path, 79% of marketing emails worldwide reach the inbox.
Attribution:
View source
Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
79%
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
Return Path
Primary
Tier C
https://www.ander.group/en/blog/a-b-testing-spam-prevention-corporate-newsletters ↗
Source Article
How to use A/B testing and avoid spam filters in your company newsletters
Original Research
Return Path
· Original study ↗
Methodology
Cited from Return Path study on email deliverability
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
marketing emails worldwide: 79% email inbox delivery rate. Source: Return Path (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/marketing-emails-inbox-delivery-rate
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<blockquote cite="https://lighthousedata.io/data/marketing-emails-inbox-delivery-rate" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>79%</strong> -- email inbox delivery rate for marketing emails worldwide<br><small>Source: Return Path (2026) · <a href="https://lighthousedata.io/data/marketing-emails-inbox-delivery-rate" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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