B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Recent
75%
75% -- click through rate lift for Email subject lines under 49 characters (2025)
Emails with subject lines under 49 characters saw a 75% increase in click-through rates compared to longer subject lines according to a Return Path study cited in the article.
Attribution:
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Lighthouse Research Team
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Source verified
Evidence graded
Value
75%
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
50
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
Return Path
Primary
Tier C
https://www.mailgo.ai/blog/cold-email-outreach-best-practices_95 ↗
Source Article
Cold Email Outreach Best Practices: How to Write Cold Emails That Get Results
Misconception
Cold Email Outreach Best Practices: How to Write Cold Emails That Get Results
Cold email isn’t dead—it’s just usually done wrong. If you're a B2B founder, SDR, or growth marketer struggling to get replies, opens, or booked calls, chances are you're overlooking some effective cold email…
Original Research
Return Path
· Original study ↗
Methodology
Secondary citation of a Return Path study comparing subject lines under 49 characters vs longer ones; relative increase in CTR. No publication date stated.
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
Email subject lines under 49 characters: 75% click through rate lift. Source: Return Path (2025). Via Lighthouse Intelligence -- https://lighthousedata.io/data/subject-lines-under-49-chars-ctr-lift
HTML Embed
<blockquote cite="https://lighthousedata.io/data/subject-lines-under-49-chars-ctr-lift" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>75%</strong> -- click through rate lift for Email subject lines under 49 characters<br><small>Source: Return Path (2025) · <a href="https://lighthousedata.io/data/subject-lines-under-49-chars-ctr-lift" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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