Some would argue that Gmail has it implemented since the day it was launched years ago. Anyway, it's still a good news to us. Yahoo is doing all the right things after they recruited their new CEO Marissa Mayer from Google. In case you missed it, the recently updated Yahoo Mail interface is also better, faster and simpler to use.
Why https? In layman term, to protect your email session from malicious eyes. It's the same reason why you want your internet banking to be in https. Want to know more about https? Check out the wiki :)
So, how do you turn on the https in Yahoo Mail? It's pretty simple actually. Go to Mail Options, scroll down and tick the box. See below:
