I have to say, I have never gotten a single spam-mail from Yahoo
from using their Groups (or eGroups before that), and I've
used them
for what, 3 years now?
Maybe not directly...
Yahoo makes its database available to outsiders. There was
an article in the New York Times a few weeks ago about this.
CompuServe also occasionally gets trawled. I can tell that
happens when I get mail with titles such as "Great news
for 1000nn,pppp!". I blanked my number, but you get the idea.
Gavin