DEEN
Postkast is Estonia's state digital inbox platform, integrated into eesti.ee. Agencies deposit official notices, citizens receive push notifications. Operated by the agency RIA; it routes messages between health IT (TEHIK), EMTA, RIK and local government (ELVL). No own RIHA entry; classification inferred from the logs.
Postkast groups four clusters: the central notification engine, health-portal routing, agency-specific channels and the management/discovery layer. Shares are daily averages over Dec 2025 – May 2026.
The most-used service endpoints across all four clusters, as requests per day. The cluster pill links to the detail page.
| # | Service | Cluster | Calls / day | Avg ms |
|---|
How do the roughly 359,000 calls/day flow from the service clusters to the consumers?
24-hour distribution of requests to the state mailbox (Postkast).
What the aggregate data reveals about the state mailbox (Postkast).
About 71 % of the load comes from the agency RIA itself — it operates the platform and delivers messages to citizens (eesti.ee). Postkast is infrastructure, not an end-user register.
Only eight organisations use Postkast directly (RIA, TEHIK, EMTA, RIK …) and then fan out to millions of citizens — typical of central infrastructure.