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Recommend a server not Hetzner
(alien.top)
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I think you answered your question "why" you got blocked here. Maybe you should state that you are trying to host an email server in your OP. Email is a hot topic and a quick way to get banned / blocked from any reputable server hoster if you fuck it up.
I have mail server for years in hetzner without problem.
Probably he have the email server misconfiguration/open relay