Update your security
Had to remove account, because outgoing server did not work any longer. Then I lost all Yahoo Mail in my Mac Mail Client on all my computers. Then I tried to reinstall YAHOO and I tried this on new systems as well, it always comes up with the account error occurred. Google account work, no problem. Yahoo is like pulling teeth. I like to reinstall that Yahoo account on my MAIL client on an Apple. How can I do that. firstname.lastname@example.org you can use for the answer. I am not paying tech support, in fact you should be paying me for this information. Installed brand new system for my brother, the same thing happened. ****** security feature that does not work for clients.
Roger Zullig commented
Contact me to reinstall YAHOO MAIL in Apple client software.