I've made the mistake of creating 2 accounts on this platform... And having them linked to important other websites (bank account, etc...). After non using them for a while, they got deleted. I was ok with that (even if i don't understand GMX doing that... For instance, my hotmail account is 17 years old and i've been able to connect to it even with years of inactivity!)
But after contacting the customer service, they are unable to reactivate my adresses, and i'm not able to create again one with the same username. The adresses are both non existant/deleted AND blocked to be used again. They told me it's normal and they can't do nothing about it.
Very bad! I hope to be able to get back the other accounts i linked with these...
Never a mail with GMX again! :(