code: def _validate_simple(email):
          
          name, address = parseaddr(email)
          if not re.match('[^@]+@[^@]+\.[^@]+', address):
              raise ValueError('Invalid email :{email}'.format(email=email))
          return address
docs: Does a simple validation of an email by matching it to a regexps
  
          :param email: The email to check
          :return: The valid Email address
  
          :raises: ValueError if value is not a valid email