SMTP Port: 465
Username: Your Yahoo Mail account email (e.g. [email protected])
Password: You will need to generate an app password for your account.
You need to input the above details into the YaySMTP settings area accordingly, then enable less secure apps in Yahoo by logging into your Yahoo account and then open "account security settings" or click here, click on the Generate app password.
An overlay will show up, choose Others and write app name as YaySMTP, click the Generate button, this will show the one-time password which you should copy and paste inside the password field on your website's YaySMTP settings screen.
Click the Save buttonto save the changes.
Now you have successfully integrate Yahoo Mail SMTP server into your WordPress site!