import re


def email_is_valid(email: str) -> bool:
    """
    Check if email address adheres to expected structure of an email address (prefix@domain).
    :param email: Email address as a string.
    :return: True if email is a valid email address, False otherwise.
    """
    if not re.fullmatch("[^@]+@[^@]+\\.[^@]+", email):
        return False
    return True