B
Evidence Grade B
Graded
under review
Safe to Cite
Current
36%
36% -- response rate increase for emails with gratitude sign-offs (2026)
Attribution:
View source
Lighthouse Research Team
Last verified:
·
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Source verified
Evidence graded
Value
36%
Unit
Percentage
Data Vintage
2026
Entity
Sample Size
350,000
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
20
Independence
30
Methodology
45
Freshness
86
Source
Boomerang
Primary
Tier A
http://www.chiefmarketer.com/why-your-email-closing-is-as-important-as-your-open-rate/ ↗
Source Article
Why Your Email Closing is as Important as Your Open Rate - Chief Marketer
Every marketer who has ever written an email has agonized over ways to improve their open rates. And naturally, once someone opens the email, you want them to take some sort of action.
The way you sign-off in your email signature could be just as important as the rest of your copy, according to a st…
Original Research
Boomerang
· Original study ↗
Methodology
Study of over 350,000 email threads
Methodology documented
Segmentation
Channelcommon_crawl
Cite this stat
Plain Text
emails with gratitude sign-offs: 36% response rate increase. Source: Boomerang (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/email-closing-response-rate-increase
HTML Embed
<blockquote cite="https://lighthousedata.io/data/email-closing-response-rate-increase" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>36%</strong> -- response rate increase for emails with gratitude sign-offs<br><small>Source: Boomerang (2026) · <a href="https://lighthousedata.io/data/email-closing-response-rate-increase" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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