B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
44.8%
44.8% -- top5 provider spf include share for Top 5 email sending providers (2026-03-15)
The top 5 email sending providers account for 44.8% of all SPF include: directives across SPF-enabled domains.
Attribution:
View source
Lighthouse Research Team
Last verified:
·
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Source verified
Evidence graded
Value
44.8%
Unit
Percentage
Data Vintage
2026-03-15
Entity
Sample Size
3,077,219
Geography
Global
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
DMARCguard
Primary
Tier A
https://dmarcguard.io/blog/email-provider-market-share/ ↗
Source Article
Email Provider Market Share 2026: Who Sends the Mail | DMARCguard
Who Sends the Internet’s Email? The 2026 Provider Market Share
Microsoft 365 sends for 19.6% of SPF-enabled domains; Google Workspace for 13.6%. That is the 2026 email provider market share on the one axis almost no chart measures — who actually sends the mail.
Most “email provider market share” and…
Original Research
DMARCguard
· Original study ↗
Methodology
Sum of top five provider shares (19.6+13.6+6.6+2.5+2.5)
Methodology documented
Segmentation
IndustryEmail Marketing
RegionGlobal
RoleAll marketers
Channelemail
Cite this stat
Plain Text
Top 5 email sending providers: 44.8% top5 provider spf include share. Source: DMARCguard (2026-03-15). Via Lighthouse Intelligence -- https://lighthousedata.io/data/top5-providers-spf-share-2026
HTML Embed
<blockquote cite="https://lighthousedata.io/data/top5-providers-spf-share-2026" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>44.8%</strong> -- top5 provider spf include share for Top 5 email sending providers<br><small>Source: DMARCguard (2026-03-15) · <a href="https://lighthousedata.io/data/top5-providers-spf-share-2026" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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