B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Recent
21%
21% -- spam complaints due to irrelevant content for email recipients (2025)
In 2025, Omnisend research found that 21% of email recipients mark emails as spam when the content feels irrelevant.
Attribution:
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Lighthouse Research Team
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Source verified
Evidence graded
Value
21%
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
Omnisend
Primary
Tier B
https://www.mailblast.io/blog/deliverability/why-emails-go-to-spam ↗
Source Article
Why Your Emails Go to Spam: 12 Reasons, Ranked by Impact
Your email campaigns look perfect. Subject lines tested. Content polished. Timing optimized. Then you check your analytics and discover half your subscribers never saw them. Gmail blocks 99.9% of spam, stopping 15 billion unwanted emails daily (Google Blog, 2024). But legitimate senders get caught i…
Original Research
Omnisend
· Original study ↗
Methodology
Omnisend research
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
email recipients: 21% spam complaints due to irrelevant content. Source: Omnisend (2025). Via Lighthouse Intelligence -- https://lighthousedata.io/data/spam-complaints-irrelevant-content-2025
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<blockquote cite="https://lighthousedata.io/data/spam-complaints-irrelevant-content-2025" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>21%</strong> -- spam complaints due to irrelevant content for email recipients<br><small>Source: Omnisend (2025) · <a href="https://lighthousedata.io/data/spam-complaints-irrelevant-content-2025" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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