B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Recent
45%
45% -- spam share of email volume for business email inboxes (2025)
Spam is estimated to account for 45% of email volume.
- Estimated figure
- Promotional product copy without cited study methodology
Attribution:
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
45%
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
50
Source Trust
60
Citation Chain
20
Independence
30
Methodology
35
Freshness
95
Source
GFI
Primary
Tier C
https://www.gfiguard.com/unlimited-network-security.asp ↗
Source Article
GFI Unlimited Network Security Multilayer security to prevent, detect, and address threats to your network
GFI Unlimited Network Security
Multilayer security to prevent, detect, and address threats to your network
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Overview:
Growing companies need to protect themselves
People may think hackers only target big companies. The truth is 66% of SMBs are now experiencing cybe…
Original Research
GFI
· Original study ↗
Methodology
Vendor page citing an estimate; no methodology stated
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
business email inboxes: 45% spam share of email volume. Source: GFI (2025). Via Lighthouse Intelligence -- https://lighthousedata.io/data/spam-share-of-email-volume
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<blockquote cite="https://lighthousedata.io/data/spam-share-of-email-volume" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>45%</strong> -- spam share of email volume for business email inboxes<br><small>Source: GFI (2025) · <a href="https://lighthousedata.io/data/spam-share-of-email-volume" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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