Most charts in our dataset move slowly. Mailbox-provider shares drift a fraction of a percentage point per year as companies migrate at their own pace. The Yandex 360 series is different: a strong climb through the 2010s, a peak of 5.56% of Tranco top-1M mail domains in December 2019, and then a long decline to 1.63% as of the 2026-07-05 snapshot — roughly 70% below the peak. Few providers of that size have ever given back that much share.
This article is not a commentary on the events of the period — it is an analysis of what a public, passively-collected dataset can and cannot tell us about them. MX records make an unusual macro instrument: every organisation that changes mailbox provider publishes the fact, globally and immediately, whether or not it ever issues a press release.
The rise: a free-tier giant
Through the 2010s, Yandex offered domain email hosting with a generous free tier at a time when Google's equivalent free offering had been discontinued for new signups. For small businesses and webmasters — far beyond Yandex's home market — it was often the most capable no-cost way to get mail on a custom domain. The DNS record of that era is unambiguous: by late 2019, Yandex's 5.56% made it one of the largest mailbox providers in the index — for scale, Microsoft 365's entire share had been 4.46% as recently as 2016 — and far ahead of every other independent provider we track.
The decline: multiple forces, one curve
A single aggregate line cannot separate causes, and honesty requires saying so. What the observable record supports:
- Commercial repackaging. The service was reorganised as Yandex 360, with the free tier for new domain connections narrowing over time. Free-tier populations are inherently mobile: domains that chose a provider because it was free re-evaluate quickly when that changes.
- Changed international context after 2022. Organisations outside Russia faced new compliance questions about where their infrastructure vendors were domiciled, while organisations inside Russia faced data-localisation requirements pulling in the opposite direction. Both pressures move MX records; from the outside we observe the net effect, not the split.
- The background consolidation trend. Every mid-sized mailbox provider lost relative ground this decade to the Google/Microsoft duopoly, which now holds 38.4% of top-1M mail domains. Some of Yandex's decline is simply this industry-wide current — though its steepness far exceeds it.
A measurement note: our classification dictionary had incomplete coverage of Yandex MX patterns for parts of 2023–2025, which is why the chart shows gaps in that window. The endpoints — 5.56% at peak, 1.63% today — are solid; the exact shape between them is reconstructed more coarsely.
What remains: a strong home market
The decline in global top-1M share does not mean irrelevance. Within Russia's email ecosystem, domestic providers remain dominant across the stack — on the ESP side, for instance, our regional slice (2026-04-28) shows Unisender alone serving 38.21% of Russian SPF-publishing domains. Email infrastructure has always been more regional than it looks from global averages, a theme we explore across country-level ESP markets. The Yandex story fits that pattern: a provider's global-index share can fall sharply while its home-market position stays strong.
The general lesson for anyone choosing email infrastructure
Strip away the specifics and a durable principle remains: a mailbox provider is a dependency with a geography. Most feature comparisons treat email hosting as a pure product decision, but the decade of data says otherwise. When evaluating any provider — whatever the country — it is reasonable to ask:
- Where is the provider domiciled, and where is mail physically stored?
- Which regulatory regimes apply to it — and to you as its customer?
- If circumstances forced a migration, how quickly could you move? (The mechanics are the same as any provider switch: MX last, TTL down, history copied.)
- How concentrated is your dependency — does the same vendor hold your mail, documents, and identity?
Organisations that could answer these questions migrated in weeks when their calculus changed. Those that could not spent months. The MX dataset records both groups with the same dispassion.
The Yandex series, alongside 30+ other mailbox and ESP providers, updates nightly in our daily email infrastructure report. The full methodology — including dictionary-coverage caveats like the one above — is published with it.