B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
6.49%
6.49% -- share of emails with likely spam trigger content for marketing emails (2026)
6.49% of marketing emails contain something likely to get them marked as spam.
Attribution:
View source
Lighthouse Research Team
Last verified:
·
How we verify data →
Source verified
Evidence graded
Value
6.49%
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
75
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
SendCheckIt
Primary
Tier B
https://sendcheckit.com/email-subject-line-tester-results?subject=Is+my+email+subject+line+good?&f… ↗
Source Article
Results for Subject Line: 'Is my email subject line good?'
-
A98 Points
Very solid subject line that should perform well for you.
-
Scannability
8/10Has a scannability higher than 5
A measure of how easy-breezy it is to read your subject line. Don't shy away from using well known industry specific terms, just don't make it complicated.
Average: 5 (lower is …
Original Research
SendCheckIt
· Original study ↗
Methodology
Aggregate subject line analysis
Methodology documented
Trend Over Time
| Period | Value | Change |
|---|---|---|
| 2022 | 6.49% | |
| 2026 (current) | 6.49% | 0% |
Segmentation
Industrymarketing
Cite this stat
Plain Text
marketing emails: 6.49% share of emails with likely spam trigger content. Source: SendCheckIt (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/emails-with-spam-trigger-words
HTML Embed
<blockquote cite="https://lighthousedata.io/data/emails-with-spam-trigger-words" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>6.49%</strong> -- share of emails with likely spam trigger content for marketing emails<br><small>Source: SendCheckIt (2026) · <a href="https://lighthousedata.io/data/emails-with-spam-trigger-words" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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