B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Recent
23%
23% -- annual email list decay rate for email marketing lists (2025)
At least 23% of an email list decays within a single year based on analysis of over 11 billion emails in 2025.
- Source states 'At least 23%'
Attribution:
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
23%
Unit
Percentage
Data Vintage
2025
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
75
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
ZeroBounce
Primary
Tier B
https://www.datamagnet.co/post/how-to-evaluate-data-enrichment-vendors/ ↗
Source Article
8 Questions to Ask Before You Buy a Data Enrichment Vendor
Disclosure: This article is published by Datamagnet. Vendor claims are self-reported unless otherwise noted.
How to Evaluate Data Enrichment Vendors: 8 Questions to Ask Before You Buy
In 2025, 37% of CRM users said they lost revenue directly because of poor data quality, and 76% said less than half …
Original Research
ZeroBounce
· Original study ↗
Methodology
Based on more than 11 billion emails processed (ZeroBounce)
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
email marketing lists: 23% annual email list decay rate. Source: ZeroBounce (2025). Via Lighthouse Intelligence -- https://lighthousedata.io/data/email-list-decay-annual-2025
HTML Embed
<blockquote cite="https://lighthousedata.io/data/email-list-decay-annual-2025" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>23%</strong> -- annual email list decay rate for email marketing lists<br><small>Source: ZeroBounce (2025) · <a href="https://lighthousedata.io/data/email-list-decay-annual-2025" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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