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This is the norm in Sweden, aside from Port 25, which you shouldn't be using anyway.

Why shouldn't you be using port 25? You need that if you want to receive email on your own mail server.

25 is plaintext.

465 is TLS, and is not blocked.

The connection is, but nobody’s using it to host local servers.

*Nobody?*

ahem; https://git.drk.sc is hosted in my home office.