According to this article in O'Reilly's Mac Dev Center, all the things I'm doing to try to prevent my address from being harvested by "spambots" fall into the "completely to mostly useless" catagory. They do mention a tool that sounds intriguing, called SpamFire, which works with any Mac mail client to filter out spam. Will have to download it and try it with Eudora, my client of choice.