C
Evidence Grade C
Graded
under review
Use with Hedging
Current
27.36%
27.36% -- email open rate for single-opted-in subscribers (2026)
Attribution:
View source
Lighthouse Research Team
Last verified:
·
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Source verified
Evidence graded
Value
27.36%
Unit
Percentage
Data Vintage
2026
Entity
Geography
Global
Evidence Quality
C
Moderate quality evidence
Useful directional data with some methodological gaps. Treat as indicative rather than definitive -- corroborate before citing in formal research.
Score breakdown
Extraction
50
Source Trust
50
Citation Chain
60
Independence
30
Methodology
30
Freshness
95
Sources (2)
GetResponse
Primary
Tier C
https://www.emailtooltester.com/en/blog/is-double-opt-in-required/ ↗
Source Article
Is double opt-in required? The legal answer + pros and cons
No, double opt-in is not required by law in most countries, including the United States under CAN-SPAM, the European Union under GDPR, and Canada under CAL. However, it is definitely considered a best practice for improving email list quality, deliverability, and clearly confirming that subscribers …
Also cited by
2026-09-25
Original Research
GetResponse
· Original study ↗
Segmentation
IndustryMedia
RegionGlobal
RoleAll marketers
Channelemail
Cite this stat
Suggested hedging: According to limited, single-source data, based on claims without stated methodology, with unverified sample sizes...
Plain Text
single-opted-in subscribers: 27.36% email open rate. Source: GetResponse (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/getresponse_single_optin_open_rate
HTML Embed
<blockquote cite="https://lighthousedata.io/data/getresponse_single_optin_open_rate" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>27.36%</strong> -- email open rate for single-opted-in subscribers<br><small>Source: GetResponse (2026) · <a href="https://lighthousedata.io/data/getresponse_single_optin_open_rate" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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