So will an address work even after it has "expired"? If so, it isn't really "expired" is it? So why describe it that way? Services ask for an email address so

So will an address work even after it has "expired"? If so, it isn't really "expired" is it? So why describe it that way? Services ask for an email address so they can contact you later. Some will even send multiple emails as part of the registration process. If they bounce, the registration is often canceled.