B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
23%
23% -- email open rate for cold email subject line 'Quick Question' (2026)
An agency switching to the subject line 'Quick Question' achieved a 23% open rate on cold emails.
- Case study from a single agency working with the author
Attribution:
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
23%
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
95
Source Trust
50
Citation Chain
90
Independence
30
Methodology
45
Freshness
86
Source
alexberman.com
Primary
Tier A
https://alexberman.com/good-cold-email-subject-lines ↗
Source Article
Good Cold Email Subject Lines That Actually Get Opened
Why Most Cold Email Subject Lines Fail
I've sent millions of cold emails across multiple companies and helped 14,000+ agencies generate over 500,000 sales meetings. Here's what I've learned: your subject line isn't there to sell anything. It's there to get the email opened. That's it.
Most people ov…
Original Research
alexberman.com
· Original study ↗
Methodology
Comparison of open rates before and after changing subject line.
Methodology documented
Segmentation
Channelcommon_crawl
Cite this stat
Plain Text
cold email subject line 'Quick Question': 23% email open rate. Source: alexberman.com (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/cold-email-open-rate-jump
HTML Embed
<blockquote cite="https://lighthousedata.io/data/cold-email-open-rate-jump" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>23%</strong> -- email open rate for cold email subject line 'Quick Question'<br><small>Source: alexberman.com (2026) · <a href="https://lighthousedata.io/data/cold-email-open-rate-jump" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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