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I'd be careful with that. You could find that being unable to connect will be taken as deliberate action to hide something or that your mail server doesn't really exist (so mail coming from it might get a false-positive on tests for mail that looks like some of its headers are faked).
It is likely that they will be scanning from a variety or locations around the global network and don't publish all the hosts used, specifically so that mail server owners can't block or avoid them.
Why would you worry about them? If they are sending false positives, any competent upstream will just ignore them completely.
Yes but the 99% incompetent won't xD
They don't scan you. The analyze the logs of many servers for bad requests. When these servers receive bad requests from you, this triggers the clean-mx reports.