Two Providers, a Stubborn Plateau and a Very Long Tail: Email in the Tranco Top-1M
Summary
Artem Berezin analyzes ten years of DNS measurements on the Tranco top-1M, showing a continued decline in self-hosted email, concentration around two providers for inbound mail, and a large long tail of unseen infrastructure. The piece highlights DMARC deployment versus enforcement, and the implications for deliverability and resilience in the global email ecosystem.