[touwer]

Love it! All European countries should have one

[sam_lowry_]

Heh, here you go: http://mxmap.be https://mxmap.ch/ https://kommune-epost-norge.netlify.app/ for Norway and https://swedish-mail-dependency.netlify.app/ for Sweden.

France even has an official map of this kind, with publicly visible recommendations: https://suiteterritoriale.anct.gouv.fr/conformite/cartograph...

Disclaimer: I made mxmap.be after seeing Swiss ant Dutch counterparts. I did not look at MX records only but also at EHLO replies, SPF and DMARC records and at fronting services.

[dkga]

Any recommendations / lessons learned when building this? I would love to give it a go for Brazil if one doesn't already exist around the time of my holidays in June/July.

[sam_lowry_]

Just take the source, and ask your LLM to do the Brazilian version. It should not take more than a couple hours, including manual checks.

Do not forget to minimize the geojson (there is even a web-based service for that) and to enable compression in your web server.

[zoobab]

In Belgium, 72% of the communes are on Microsoft 365:

https://jurgen.gaeremyn.be/2025/03/08/european-critical-depe...

"Purely based on the MX-records, we learn that 72% of Belgian municipalities run Microsoft mail servers and 60% of the Dutch municipalities. For Scandinavia, it’s 64% in Norway and 57% in Sweden. In Finland, it’s a whopping 77% if the cities that are being served by Microsoft."

[jimnotgym]

Running a Microsoft mail server doesn't automatically mean you are on 365. You can still host Exchange onsite