You can improve Yahoo mail by firing everyone who's currently in charge.
Everyone who works for Yahoo is incompetent and wildly bad at their jobs. Yahoo, and Verizon, shouldn't be paying any of these people a single cent. This is the most poorly developed website on the internet, and you have the traffic to be one of the best.
You're pathetic. You must not have a single intelligent manager or employee.
You lose traffic, so you anger everyone with whitelisting so you lose even more traffic? Are you people stupid? That's rhetorical. Which means it's not supposed to be answered, since I doubt anyone at Yahoo is even smart enough to know that word.
This website is a completely and utterly wasted resource. Everyone from top to bottom working on this website should be fired.
None of you deserve a paycheck.