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A map of ~15,300 municipalities in Germany, Austria, and Switzerland showing which provider handles their official email, grouped by jurisdiction, based on public DNS records and other public network signals.
Digital sovereignty: US-based providers are subject to the US CLOUD Act, which allows US authorities to request stored data, regardless of where it is physically hosted.
Each municipality's official domain is checked via DNS records, SMTP banners, ASN lookups, and other signals, then classified by provider type with confidence scoring.
Part of an ongoing research project currently in peer review. The code and data are on GitHub.