Danke für die prompte Antwort.

Mit der Erreichbarkeit des Supports meinte ich auch die Erreichbarkeit per E-Mail. Meine letzten Versuche, support@bitcoin.de zu erreichen, wurden folgendermaßen beantwortet:

"Delivery to the following recipient failed permanently:

    support@bitcoin.de

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 550 550 sorry, no mailbox here by that name. (#5.7.17)
 (state 14)."