Thanks a lot. Now i received all the activation e-mails from the Whonix forum.
Thus it seems to work now.
But now i have a new problem.
I want to keep this accountname “firefox”, but i can’t use my real e-mail at the moment, because the whonix forum software says, that this is already in use by the other account i tried to create before.
Does the older account, that was never activated expire some day, so that i can use my e-mail for this account?
And if i change my e-mail in the forum, will i get some sort of confirmation call to my old e-mail? The old e-mail for this account is a trashmail mail provider, i no more have access of the inbox, because it stops to exist after 24 h.