B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
0.34%
0.34% -- share of best practice emails with excessive punctuation for best practice emails (2026)
0.34% of best practice emails contain excessive punctuation in their subject lines.
Attribution:
View source
Lighthouse Research Team
Last verified:
·
How we verify data →
Source verified
Evidence graded
Value
0.34%
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
Segmentation
Industrymarketing
Cite this stat
Plain Text
best practice emails: 0.34% share of best practice emails with excessive punctuation. Source: SendCheckIt (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/best-practice-emails-excessive-punctuation
HTML Embed
<blockquote cite="https://lighthousedata.io/data/best-practice-emails-excessive-punctuation" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>0.34%</strong> -- share of best practice emails with excessive punctuation for best practice emails<br><small>Source: SendCheckIt (2026) · <a href="https://lighthousedata.io/data/best-practice-emails-excessive-punctuation" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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