B
Evidence Grade B
Graded
under review
Safe to Cite
Current
50%
50% -- open rate increase for Email marketing with personalized subject lines (2026)
Attribution:
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Lighthouse Research Team
Last verified:
·
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Source verified
Evidence graded
Value
50%
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
Human Marketing
Primary
Tier B
https://human.marketing/blog/how-to-increase-email-conversion-rates ↗
Source Article
7 Data-Backed Strategies for Boosting Email Conversion Rates
7 Data-Backed Strategies for Boosting Email Conversion Rates
You’ve got mail! We’ll show you how to improve email conversion rates and boost revenue with these seven proven email marketing tactics.
Email marketing is one of the most profitable digital marketing channels. You can generate some seriou…
Original Research
Human Marketing
· Original study ↗
Methodology
Increase in open rates for emails with personalized subject lines
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
Email marketing with personalized subject lines: 50% open rate increase. Source: Human Marketing (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/personalized_subject_line_open_rate_increase
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<blockquote cite="https://lighthousedata.io/data/personalized_subject_line_open_rate_increase" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>50%</strong> -- open rate increase for Email marketing with personalized subject lines<br><small>Source: Human Marketing (2026) · <a href="https://lighthousedata.io/data/personalized_subject_line_open_rate_increase" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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