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A map of all ~2,100 Swiss municipalities showing which provider handles their official email — grouped by jurisdiction — based on public DNS records and other public network signals.
US-based providers are subject to the US CLOUD Act, allowing US authorities to request stored data regardless of where it is hosted. This map makes the current provider landscape visible.
Each municipality's email domain is checked against multiple public DNS and network signals, then classified by provider type.
Classifications may contain errors. DNS records indicate mail routing, not necessarily where data is stored.
If you notice an error, please submit an issue.
The code and data are on GitHub.