Please don't use temporary, throwaway email addresses or addresses that you may lose control of in the future. You will not be able to change the registered Email after signing up, and may need access to it in order to reset your password or validate account ownership.
A valid email address is required to verify your account, recover your password and to receive security notifications. Only one account can be registered per email address.
If your email is blacklisted and it shouldn't be, please ask for help in Discord.