● Covered by 1 source · 1 reportMedium impact1 neutral
Self-hosted email for top domains declines to 22.4%, consolidating around Google and Microsoft
Key points
- Self-hosted email declined from 44.6% (2016) to 22.4% (2026) for top domains.
- Google Workspace and Microsoft 365 handle 38.6% of inbound mail for these domains.
- Email infrastructure is consolidating around two major providers.
- Centralization poses resilience risks for the email ecosystem.
Decline in Self-Hosted Email
DNS measurements over a decade reveal a steep decline in self-hosted email servers among the internet's top one million domains. In 2016, 44.6% of domains published their own mail servers, a figure that has now fallen to 22.4% as of July 18, 2026. This trend continues, with a half-percentage point drop in the last month alone.
Consolidation Around Major Providers
The domains that stopped self-hosting have largely migrated to major email service providers. Google Workspace now receives mail for 21.8% of MX-publishing domains, and Microsoft 365 handles 16.8%. Together, these two companies manage 38.6% of the measured internet's inbound email traffic, indicating significant market consolidation. Other providers, such as Proofpoint, hold a much smaller share at 1.9%.
Implications for Ecosystem Resilience
This centralization of email infrastructure, similar to trends seen in DNS and CDN services, presents resilience challenges. When over a third of popular domains rely on just two providers for email reception, an outage, filtering change, or policy decision by either Google or Microsoft can have widespread effects across the entire email ecosystem. Unlike CDNs, email lacks a graceful fallback mechanism, meaning rejected messages are simply lost.
✨ This summary was generated by AI from the outlets' reporting listed below. It is not independently verified and may contain errors — check the original sources. How BrevFeed works →
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Primary sources
arXiv 2002.10731Reporting from
Analysis of DNS records over ten years shows a significant decline in self-hosted email servers among the top one million domains, dropping from 44.6% in 2016 to 22.4% currently. This shift indicates increasing centralization of email infrastructure, with Google Workspace and Microsoft 365 now handling inbound mail for 38.6% of these domains combined. The consolidation raises concerns about ecosystem resilience, as outages or policy changes at these two providers could impact a large portion of the internet's email traffic.