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The Check Bounce List function works to know if your email address is in the bounce list. Sometimes when the email alerts of your form are not correctly setup, the notification email that is sent to you will not arrive on your inbox. So, ur servers will try several times to deliver the messages for a given time-frame , but if the delivery fails, it will mark it as "old", "rejected" or similar, and it will store your recipient email address into our bounce list.
You can read more about when and how your email address is store in the bounce in this guide: How to setupe email alerts to prevent email bouncing related issues
So the Check Bounce List tool will help you to confirm if your email is in the bounce list or not.
I hope this helps. Please inform us if you need further assistance wtih this inquiry.