I've used Yahoo Mail for over 25 years, and now you have found a way for me to need to change all that!
My business thrived on my ability to find my customers. Now you have taken a working system and BROKEN it! If there is no way to revert back to the working email system I had before, I'm going to cancel my PAID membership and start using the GOOGLE empire...

FALSE ALARM! I mean, OLD MAN ALERT! I use Google Browser and I pressed a button called "Mobile View Switcher". Nothing happened. The next day, BANG! My Yahoo Email was crippled! TG I figured it out. My Yahoo Email is the most essential internet service after my Shopping Cart!