Why this is important?
Before you can send email notifications, you need to configure the email settings, in Setting -> Setting email. With incorrect or incomplete setup the emails will never reach your inbox.
Configure SMTP Method
These settings here would depend on your email provider.
Settings for Gmail, or a Google Apps account can be found here. For Yahoo, try this. If you are using Google Apps, you may need to enable the option ‘Enforce Less Secure Apps’. You can read about it here.
If you are using GoDaddy, set the SMTP Host to localhost, and leave the Username, Password and Port as blank.
If you are using an email provided by your web host, you would find the settings with them.
if you do not receive emails using the ‘WP-mail’ method then try the ‘SMTP’ method. If the letters still do not arrive in 90% of cases, this is due to your hosting provider.