B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Recent
28.3%
28.3% -- spam rate for emails sent in batches of 10 (2025)
For emails sent in batches of 10, 28.3% were placed in spam.
Attribution:
View source
Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
28.3%
Unit
Percentage
Data Vintage
2025
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
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
Warmy
Primary
Tier A
https://www.warmy.io/blog/batch-sending-deliverability/ ↗
Source Article
Does Email Batch Size Matter? A Year of Deliverability Data Has The Answer - Warmy Blog
Email deliverability conversations often focus on what you send: subject lines, copy, personalization, authentication. Far less attention is paid to how emails are sent: specifically, batch size and sending cadence.
Yet mailbox providers do not evaluate emails alone. They observe traffic patterns, t…
Original Research
Warmy
· Original study ↗
Methodology
Across more than 20 million emails sent in batches of 10
Methodology documented
Segmentation
IndustryEmail Marketing
RoleEmail Marketing Specialist
Channelemail
Cite this stat
Plain Text
emails sent in batches of 10: 28.3% spam rate. Source: Warmy (2025). Via Lighthouse Intelligence -- https://lighthousedata.io/data/email-spam-rate-batch-10
HTML Embed
<blockquote cite="https://lighthousedata.io/data/email-spam-rate-batch-10" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>28.3%</strong> -- spam rate for emails sent in batches of 10<br><small>Source: Warmy (2025) · <a href="https://lighthousedata.io/data/email-spam-rate-batch-10" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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