B Evidence Grade B Graded accuracy verified by the review judge Safe to Cite Dated

88.1%

88.1% -- spam share of email volume for global email traffic (2009-07)

Name: Spam Share Of Email Volume Statistics
Creator: Lighthouse Intelligence
Published: 2026-09-15

2009-07 · Cisco (IronPort SenderBase)

In July 2009, spam accounted for 88.1% of total email volume.

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Attribution: Cisco (IronPort SenderBase) View source

Lighthouse Research Team

Last verified: 2026-09-15 · How we verify data →

Source verified Evidence graded

Value

88.1%

Unit

Percentage

Data Vintage

2009-07

Entity

global email traffic

Evidence Quality

Strong, reliable evidence

Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.

61/100 confidence

Single source - not yet corroborated

Score breakdown

Extraction

Source Trust

Citation Chain

Independence

Methodology

Freshness

Source

Cisco (IronPort SenderBase) Primary Tier B

http://emailblog.eu/2011/01/10/spam-volume-declined-in-last-quarter-of-2010/ ↗

Confidence: 53/100 Vintage: 2009-07 Channel: Common Crawl

Source Article

Spam volume declined in last quarter of 2010

Original Research

Cisco (IronPort SenderBase) · Original study ↗

Methodology

Cisco IronPort SenderBase data cited by emailblog.eu; European decimal comma in source (88,1 = 88.1%).

Methodology documented

Trend Over Time

Period	Value	Change
2009-07 (current)	88.1%
Q3 2007	95%	+7.8%

Segmentation

Industrymarketing

Cite this stat

Plain Text

global email traffic: 88.1% spam share of email volume. Source: Cisco (IronPort SenderBase) (2009-07). Via Lighthouse Intelligence -- https://lighthousedata.io/data/spam-share-of-email-volume-july-2009

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<blockquote cite="https://lighthousedata.io/data/spam-share-of-email-volume-july-2009" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>88.1%</strong> -- spam share of email volume for global email traffic<br><small>Source: Cisco (IronPort SenderBase) (2009-07) · <a href="https://lighthousedata.io/data/spam-share-of-email-volume-july-2009" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>

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