disintegr8te 
@jerry Somehow they Protect their Customers here, you host your Services in Germany but you are not complying with German Law (GDPR, TMG etc.).
Jerry 🦙💝🦙@disintegr8te How so?
@jerry its multiple Things but mainly you are forced by law if you host a Web Service in Germany to post a Contact for Data Privacy and a Legal Contact.
So by blocking your Mail Server they are blocking „Illegal Web Services“ to protect their Customers.
So by blocking your Mail Server they are blocking „Illegal Web Services“ to protect their Customers.
@jerry dont want to say i agree with their Approach but there is a Logic to it and it could generally lead into a shutdown of the Instance if this Legal Framework isnt fixed or moved to an non EU Legislation