Step 1 - Login Yahoo account by web browser
Step 2 - Click User Profile on Right Top side
Step 3 - Click Account Info
Step 4 - Click Account Security
Step 5 - Click Generate app password
Step 6 - Click drop down button on Select your app
Step 7 - Choose Other app
Step 8 - Change app name to QnE and Click Generate
Step 9 - Copy the password that generate by Yahoo for 3rd party app.
Step 10 - Login QnE Software and go to email setting
Step 11 - Paste the password into Password field
Step 12 - Batch Email successful sent out by using Yahoo account.