Account blocked

You'll need to contact our billing department at this point, because we'll need to verify account ownership before we can assist you with your original issue. They can be reached at billing@dyndns.com

Yes, if you know the username and password. You'll need to contact DynDNS for account assistance though.

I tried it. The answer:

Greetings,

We do not recognize your email address *****@gmx.de, so your message has NOT been submitted to http://DynDNS.com Support. We require that you correspond from the email address on the account so we can better handle your query and to protect the security of your account.

To submit your query, visit this page:

https://www.dyndns.com/support/contact/email.html

You can also send email to support@dyndns.com using the address on your account.

:-(

Thanks. I've sent a mail to billing@dyndns.com.