In a video tutorial, viewers are shown how to use the Zero Bounce API in conjunction with the RapidAPI Google Sheets plugin to validate email addresses on a prospecting list. This process helps reduce the risk of high bounce rates and potential blacklisting by confirming the validity of email addresses before sending communications. The tutorial guides users through subscribing to the Zero Bounce API via RapidAPI, setting it up in Google Sheets, and using a formula with the get function to retrieve the validity status of each email. The method involves inserting the API URL, RapidAPI key, and email parameters into the sheet, enabling users to efficiently check multiple email addresses. This approach leverages the free plan's allowance of 100 requests per month, providing an accessible entry point for users seeking to improve their email list hygiene.