You could improve by having a setting to block spam entirely.
Have more people that work for yahoo,view spam and possible virus websites that are sent to yahoo mail, and keep track of what people sign up for to go to their e-mail, and if they have not signed for certain websites block them.

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Anonymous commented
If any cons or hackers are looking at this, the FBI and other state and government jobs are looking for people that are skilled in computer use. Put your computer talents to good use, and not for bad, you hurt innocent people, especially the elderly that do not have much revenue coming in. I would like to ask one question, how does it make you feel to take someone's money, and know that this could be all the income they have?
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Anonymous commented
I used to like Gmail, because they did not allow so many ads or other websites to enter my list, now Yahoo keeps most unwanted stuff out, but progress is needed to watch carefully the cons and spam that causes the viruses. Luckily I have virus protection, and even though I do not push on these websites, on one of my computers I received two virus anyhow, that cost $300.00 just to get it fixed. If people are so smart to hack and con people, then they need to get a legal job and they could probably make actual money, without causing trouble and possible jail time.