Sometimes its necessary to keep the log of emails that website send. This feature can help us to identify any email delivery issue with WordPress actions such as email delivery after contact form submit, new order notification or just note to customer for order status update.
Postman plugin which I generally use to keep track what kind of email website is sending and to whom. It is also a kind of email backup just in case you lost your email(s).
To configure email logging, add new Postman plugin from WordPress repository.
Once install and activated this plugin will create ever present link to access log in admin screen. Check the following image.
Clicking the Email Log link, lists all email sent by the website. More settings for the plugin can be found under Settings > Postman SMTP.