I've had similar problems on occasion from other types of services.
Ethics has absolutely nothing to do with it.
The best place to report the problem is Compuserve's internal IS organization. Like any large company, Compuserve makes decisions based on economics, not ethics, and accurate billing is financially preferable to ill will and bad publicity. This is a fake email address. So many old members of this list were getting spam generated from siphons trolling the archives that I replaced all email addresses with randomly generated spam traps that forward mail to spam fighters. If you need to reach individuals mentioned in these archives, use a search engine to find their current location, as these addresses and archives date from 1994 to 1996.