Terrible
I downloaded this app because my regular I phone app kept requesting me to sign in to my Yahoo email accounts over and over again. The same thing happened when I tried using other email apps, but only with Yahoo email accounts. I thought using the Yahoo email app would put a stop to this. Not. I still keep signing in to my accounts several times. Does not happen with my gmail accounts or with Office 365 accounts. Should be a minus 3 stars.
FU as in FortUne about
Yahoo Mail - Organized Email, v4.12