I’m sorry, but email account creation is disabled because we don’t want people to use it anymore. That includes accounts which already have email accounts. So I’m sorry to say you cannot recreate that account.
If you want to receive email on that address again, you may want to do what all newer users have to do as well: find a different email provider to handle email for your domain.
And if you just want an SSL certificate, you can use our Free SSL Certificates tool, which lets you create certificates for free subdomains now without any email validation.