B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
15,000,000,000
15,000,000,000 -- spam messages blocked daily for Gmail RETVec (2026)
Gmail's RETVec system blocks over 15 billion unwanted messages daily.
- Reported as 'over 15 billion' with 99.9% accuracy
Attribution:
View source
Lighthouse Research Team
Last verified:
·
How we verify data →
Source verified
Evidence graded
Value
15,000,000,000
Unit
Count
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
50
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
outreachalmanac.com
Primary
Tier C
https://outreachalmanac.com/guides/cold-email-changes-2026/ ↗
Source Article
7 Critical Cold Email Changes Coming in 2026 (And How to Adapt) | Outreach Almanac
Cold email is not dying. But the playbook that worked in 2022 is actively destroying campaigns in 2026.
The evidence is stark: reply rates have declined 15% year-over-year for six consecutive years. The tactics that built agencies and filled pipelines just three years ago now trigger spam filters, d…
Original Research
outreachalmanac.com
· Original study ↗
Methodology
Citing Google/Microsoft research
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
Gmail RETVec: 15,000,000,000 spam messages blocked daily. Source: outreachalmanac.com (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/gmail-retvec-blocked-messages
HTML Embed
<blockquote cite="https://lighthousedata.io/data/gmail-retvec-blocked-messages" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>15,000,000,000</strong> -- spam messages blocked daily for Gmail RETVec<br><small>Source: outreachalmanac.com (2026) · <a href="https://lighthousedata.io/data/gmail-retvec-blocked-messages" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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