B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
12.3%
12.3% -- spf include category share for Transactional ESPs (2026-03-15)
Transactional email service providers account for 12.3% of SPF includes across SPF-enabled domains.
- Provider categories sum past 100% because domains stack mailbox, transactional, and security providers.
Attribution:
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Lighthouse Research Team
Last verified:
·
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Source verified
Evidence graded
Value
12.3%
Unit
Percentage
Data Vintage
2026-03-15
Entity
Sample Size
3,077,219
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
Provider category share from SPF include mapping
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
Transactional ESPs: 12.3% spf include category share. Source: DMARCguard (2026-03-15). Via Lighthouse Intelligence -- https://lighthousedata.io/data/transactional-category-spf-share-2026
HTML Embed
<blockquote cite="https://lighthousedata.io/data/transactional-category-spf-share-2026" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>12.3%</strong> -- spf include category share for Transactional ESPs<br><small>Source: DMARCguard (2026-03-15) · <a href="https://lighthousedata.io/data/transactional-category-spf-share-2026" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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