Question: apple.smtp.mail.yahoo.com error message
I was going crazy when I could not email from my ipad. I could receive email. I was getting a failed message. I could not find a solution any place on the net.
This how I resolved it. Yahoo now requires an “app password”. so go to yahoo security for your account and follow the instructions for creating an app password for your ipad, iphone, etc.
iPad (3rd gen) Wi-Fi, iOS 8