2,100 Swiss municipalities showing which provider handles their official email

2026-04-19 | original

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Why This Matters

This map of Swiss municipalities' official email providers highlights the importance of digital sovereignty and transparency in government communications. By revealing which providers handle official emails, it underscores concerns about data privacy, especially with US-based providers subject to the CLOUD Act. This visibility encourages discussions on data security and the need for localized or sovereign solutions in government infrastructure.

Key Takeaways

Reveals the provider landscape for Swiss municipal official emails.
Highlights concerns over US-based providers and data sovereignty.
Uses public network signals to classify and map email service providers.

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.

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. This map makes the current provider landscape visible.

How does it work?

Each municipality's official domain is checked via 11 signals from DNS records, SMTP banners, ASN lookups, and a public Microsoft API endpoint, then classified by provider type with confidence scoring.

Disclaimer: DNS records indicate mail routing and authorized senders, not necessarily where data is stored.

Explore topics: swiss municipalities public dns records cloud act microsoft api email providers