B
Evidence Grade B
Graded
under review
Safe to Cite
Current
83%
83% -- percentage of email nondelivery cases attributable to bad sender reputation for Email deliverability failures (email marketing campaigns) (2026)
Attribution:
View source
Lighthouse Research Team
Last verified:
·
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Source verified
Evidence graded
Value
83%
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
http://www.email-validator.net/email-list-validation-cleaning.html ↗
Source Article
Email Address List Verification & Cleaning
Original Research
Return Path
· Original study ↗
Methodology
Vendor product page citing a Return Path study on email deliverability; specific study year and methodology not stated on this page.
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
Email deliverability failures (email marketing campaigns): 83% percentage of email nondelivery cases attributable to bad sender reputation. Source: Return Path (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/sender-reputation-email-nondelivery-83pct
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<blockquote cite="https://lighthousedata.io/data/sender-reputation-email-nondelivery-83pct" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>83%</strong> -- percentage of email nondelivery cases attributable to bad sender reputation for Email deliverability failures (email marketing campaigns)<br><small>Source: Return Path (2026) · <a href="https://lighthousedata.io/data/sender-reputation-email-nondelivery-83pct" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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