B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
39%
39% -- share of email marketers rarely or never cleaning lists for Email marketers (2026)
Around 39% of email marketers rarely or never clean their contact lists.
Attribution:
View source
Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
39%
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
Stripo
Primary
Tier C
https://e-warmup.com/blog/inbox-placement-test-metric-decides-open-rate/ ↗
Source Article
Inbox Placement Test: The Metric That Decides Your Open Rate (2026 Guide)
You sent 10,000 emails. Your ESP reported 98% delivered. Your open rate came back at 6%.
Something is very wrong. But your dashboard says everything is fine.
Here is what actually happened: your emails landed in spam. Or the promotions tab. Or somewhere your subscribers never look. The delivery rate…
Original Research
Stripo
· Original study ↗
Methodology
Stripo's 2026 deliverability statistics
Methodology documented
Segmentation
Industrymarketing
RoleEmail Marketer
Channelemail
Cite this stat
Plain Text
Email marketers: 39% share of email marketers rarely or never cleaning lists. Source: Stripo (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/email-marketers-list-cleaning-2026
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<blockquote cite="https://lighthousedata.io/data/email-marketers-list-cleaning-2026" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>39%</strong> -- share of email marketers rarely or never cleaning lists for Email marketers<br><small>Source: Stripo (2026) · <a href="https://lighthousedata.io/data/email-marketers-list-cleaning-2026" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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