import re


def is_email_address_valid(email):
    """
    Validate the email address using a regex.

    It may not include any whitespaces, has exactly one "@" and at least one "." after the "@".
    """
    if " " in email:
        return False
    # if not re.match("^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)*$", email):
    # More permissive regex: does allow non-ascii chars
    if not re.match(r"[^@]+@[^@]+\.[^@]+", email):
        return False
    return True