B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
6.49%
6.49% -- share of emails containing likely spam trigger words for marketing emails (2026)
6.49% of marketing email subject lines contain words or phrases likely to get them marked as spam.
Attribution:
View source
Lighthouse Research Team
Last verified:
·
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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 ↗
Source Article
Results for Subject Line: 'Easy-as-Pie Year-End Email Series'
-
B83 Points
You may be able to improve with some tweaks.
-
Scannability
1/10Has a scannability less 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 better) -
Readi…
Original Research
SendCheckIt
· Original study ↗
Methodology
SendCheckIt aggregate dataset
Methodology documented
Segmentation
Industryemail_marketing
RoleAll marketers
Channelemail
Cite this stat
Plain Text
marketing emails: 6.49% share of emails containing likely spam trigger words. Source: SendCheckIt (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/email-subject-spam-words-6-49
HTML Embed
<blockquote cite="https://lighthousedata.io/data/email-subject-spam-words-6-49" 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 containing likely spam trigger words for marketing emails<br><small>Source: SendCheckIt (2026) · <a href="https://lighthousedata.io/data/email-subject-spam-words-6-49" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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