Register in the GommeHD.Net forum but both emails have already been used by jmd?

Minecraft has a server called "GommeHD.Net" and this server also has a forum where I would like to register, I have 2 emails as well. Whenever I want to use one of them, it says "the specified email address is already being used by another user".

What shall I do now?

Make new ones

Click Sign in, and then click Forgot Password. If you're lucky, the account name will be in the email.