B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Recent
69%
69% -- spam rate for email recipients (2025)
Nearly 69% of people will mark an email as spam based on nothing more than what they see in that subject line.
- based on nothing more than what they see in the subject line
Attribution:
View source
Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
69%
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
50
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
ZeroBounce
Primary
Tier B
https://www.zerobounce.net/resources/email-marketing-statistics/ ↗
Source Article
How to Determine What Email Subject Lines for Marketing Actually Fit Your Audience
Your email subject line is the entire sales pitch before the sale even starts. If it does not land, nothing else matters. Not your offer, not your design, not the three hours you spent writing the perfect email body. About 47% of email recipients decide whether to open an email based on the subject …
Original Research
ZeroBounce
· Original study ↗
Methodology
Based on ZeroBounce's 2025 research
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
email recipients: 69% spam rate. Source: ZeroBounce (2025). Via Lighthouse Intelligence -- https://lighthousedata.io/data/spam_based_on_subject_line
HTML Embed
<blockquote cite="https://lighthousedata.io/data/spam_based_on_subject_line" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>69%</strong> -- spam rate for email recipients<br><small>Source: ZeroBounce (2025) · <a href="https://lighthousedata.io/data/spam_based_on_subject_line" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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