Fraud mail?

Yahoo is not doing enough to eliminate fraud Spam from entering into our Spam or our In boxes. Many of the fraudulent Spams are well know and listed on dedicated websites e.g. United Cargo Solutions. Surely it is within Yahoo’s competence, and responsibility, to identify such fraudulent mail and automatically prevent it being received. Admittedly those phising ones from fictitious people with Arabic or African sounding names caliming to be workers with soem African bank, also often using yahoo addresses, are more difficult to sift but a lot of the others are well-known.