B
Evidence Grade B
Graded
under review
Safe to Cite
Current
20%
20% -- email inbox delivery failure rate for Emails (2026)
Attribution:
View source
Lighthouse Research Team
Last verified:
·
How we verify data →
Source verified
Evidence graded
Value
20%
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.augmente-ton-trafic.fr/e-zines-pour-communication-digitale-relancer-lengagement-de-votre… ↗
Source Article
E-zines pour communication digitale : relancer l’engagement de votre communauté
Original Research
Return Path
· Original study ↗
Methodology
Article attributes to Return Path (email deliverability analysis firm): nearly 20% of emails do not reach recipients' inboxes; no study date given, collection year used
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
Emails: 20% email inbox delivery failure rate. Source: Return Path (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/emails-not-reaching-inbox
HTML Embed
<blockquote cite="https://lighthousedata.io/data/emails-not-reaching-inbox" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>20%</strong> -- email inbox delivery failure rate for Emails<br><small>Source: Return Path (2026) · <a href="https://lighthousedata.io/data/emails-not-reaching-inbox" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
Share
Related Statistics
Use this data in your work
Copy the citation, embed the widget, or explore thousands more verified marketing statistics -- all free.