C
Evidence Grade C
Graded
accuracy verified by the review judge
Use with Hedging
Current
0.5%
0.5% -- hard bounce rate threshold for Email marketing (2026)
The recommended target threshold for hard bounce rate in the sender score health formula is under 0.5%.
- Recommended target threshold (< 0.5%) for a sender score health calculation
Attribution:
View source
Lighthouse Research Team
Last verified:
·
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Source verified
Evidence graded
Value
0.5%
Unit
Percentage
Data Vintage
2026
Entity
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
95
Source Trust
60
Citation Chain
20
Independence
30
Methodology
30
Freshness
95
Sources (2)
Litmus
Primary
Tier A
https://datainnovation.io/en/email-deliverability-best-practices-2026-what-changed-and-what-still-wo… ↗
Source Article
Email Deliverability Best Practices 2026: What Changed and What Still Works
If you ran a clean email program in 2024 and haven’t touched your setup since, you’re already behind. Not because everything changed – most foundational mechanics haven’t – but because the thresholds tightened, the mailbox providers got faster at pattern detection, and several assumptions that worke…
Also cited by
MailCleanup
https://mailcleanup.com/email-list-hygiene/
2026-09-29
Original Research
Litmus
· Original study ↗
Segmentation
Industrymarketing
Cite this stat
Suggested hedging: According to limited, single-source data, based on claims without stated methodology, with unverified sample sizes...
Plain Text
Email marketing: 0.5% hard bounce rate threshold. Source: Litmus (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/hard-bounce-rate-threshold
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<blockquote cite="https://lighthousedata.io/data/hard-bounce-rate-threshold" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>0.5%</strong> -- hard bounce rate threshold for Email marketing<br><small>Source: Litmus (2026) · <a href="https://lighthousedata.io/data/hard-bounce-rate-threshold" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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