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TIL my university #tuwien blocks incoming emails for the entire .host top-level-domain. Many #mastodon servers are hosted on masto.host, so this would block all confirmation mails from any of these servers (e.g. my instance), making it impossible to register an account. The mails are not even marked as spam, they are simply not delivered (while acknowledging delivery to the sender).

Is it only me, or is this a quite unbelievable and unacceptable intervention in communication infrastructure?