Still, do you find such spam coming from those lists which are 100% opt-in? If Yahoo 100% opt-in?
For the spam from Yahoo, is there a pattern? For example, I find that the greatest risk for FPs are those instances where the list saves up a day's worth of posts and then sends all of it in one e-mail.
The main problems I've seen with whitelisting Yahoo groups are on those that are unmoderated. For example:
1. You sign up for a group about vintage widgets.
2. Spammer sends a message to your vintage widget list.
3. You get the spam through a whitelisted, opt-in channel.
4. List members & owner get up in arms, flame war ensues over whether the list should be closed or kept open, whether Yahoo isn't doing its job filtering posts, whether it's Yahoo's business to filter posts, etc.
5. Repeat steps 2-4 until the owner decides to limit posting to members.
6. Spammer signs up for Yahoo account, signs up for list, posts spam.
7. Same as step 4.
8. Repeat steps 6-7 until list owner decides to enable some degree of moderation.
-- Kelson Vibber SpeedGate Communications <www.speed.net>
