Hi SandrasStitchS1,
If your goal is to block a specific list of emails, you might find the Fraud Filter app by Shopify useful. One of the benefits of this app is that it’s available at no cost. However, it’s worth noting that its ratings are somewhat lower compared to other apps in the Shopify App Store.
For additional options, you can explore the App Store by searching for “fraud filter” to find a solution that best meets your needs.
I hope you find this information helpful!