Yahoo, best friend of spammers everywhere
Couldn't happen to a more deserving company. Of the big three, Yahoo is clearly #1 in supporting spammers, especially in providing the dropboxes to reach suckers, but also in helping the spammers with the separate throwaway addresses where so much of the spam comes from.
If Yahoo had been serious about shutting down the spammers' business models starting some years ago, we would be in a much better world. Now it's basically too late and we are dealing with serious and professional criminals, but... Imagine if Yahoo had provided integrated anti-spammer tools starting several years ago. Rather than playing games and feeding the spammers while they grew so strong and dangerous, we--ALL of the people who sincerely and fiercely hate spam--could have helped shut down ALL of the spammers' infrastructure, pursue ALL of the spammers' accomplices, and help and protect ALL of the spammers' victims. The "victims" is not just the suckers who send money to the spammers, but the corporations whose reputations are abused by the spammers, and even all of the other people who use the Internet. Also, can you imagine the value added to Yahoo Mail if the spammers were afraid of it? Given the reality, that's a ROFLMAO act of imagination.
Oh well. Evidently it's too late now. We don't have any option but to live with the spammers. Certainly nothing Yahoo can do about it. They can barely keep their email system afloat on the tide of their own spam.