Yahoo has added a "marketing" area to the account set up area of groups.
When you go into it you will see that they have set you to "yes" on
everything. I highly advise everyone to go in and change it.
When you're logged in at Yahoogroups, click on Account Info on the top right
corner of the screen. Enter your password when prompted, then below the
listing of your email addresses, you'll see a link for "Edit Marketing
Preferences", click on that. You'll see it's set to Yes (please send me
spam) on every option. Set them all to No, don't forget the two towards the
bottom of the page about phone and snail mail spam and click the button to
save it.
Thanks to Laura Trout for passing this along.
luv,
-Su