Allow Less Secure Apps to Access Your Yahoo Mail
Log in to Yahoo mailbox using your mail ID and password.
Then go to Account Info page from the Profile option.
Choose “Account Security” phase.
Go to the bottom of the page where you will find “App password” option .
You have to “Generate app password” to go on next step.
You will get a details here about ”When do I need an app password?”
Click the Get Started button.
Here “Generate an app password” by ‘Entering your app’s name.
You will get an app password through this process. You have to use this password when you will login into any third party app account.