Hello there, ozmarks.

We can check the list of bounced data by going to the Tasks section. You can do that by clicking Dashboard and then selecting Get things done. Click the bounced data that you want to view on the Tasks drop-down.

I've also added a reference on how to view lists of bounced emails: How To View List Of Bounced Emails With Delivery Errors.

I'll be around if you need help. Stay safe!