The two restrictions have both been implemented within the past two weeks and are still in place.
With the new Account Key feature, users of the Yahoo Mail app are no longer required to type in their passwords.
At SXSW, the company unveiled a phone-based, password-free login.
Online privacy champion Alex Stamos is making it a lot tougher for hackers and spies to snoop around Yahoo's insides. Here's what you need to know.