1. Turn off less secure access setting to your Yahoo account by clicking here: https://login.yahoo.com/account/security#other-apps and turning off "Allow apps that use less secure sign in".
2. Use the Yahoo Mail app for Android and iOS, which includes important security features. You can also use Yahoo Mail via https://mail.yahoo.com.
For more information, visit our help page at: https://help.yahoo.com/kb/SLN27791.html.