code: def create(gandi, email, quota, fallback, alias, password):
      
      login, domain = email
      options = {}
  
      if not password:
          password = click.prompt('password', hide_input=True,
                                  confirmation_prompt=True)
      options['password'] = password
      if quota is not None:
          options['quota'] = quota
      if fallback is not None:
          options['fallback_email'] = fallback
  
      result = gandi.mail.create(domain, login, options, alias)
  
      return result
docs: Create a mailbox.