Scroll to the bottom of this page. You will see a section labeled "The following email addresses are blocked".
Finding your blocked email list in Gmail is essential for managing your privacy or fixing an accidental block. While the steps differ slightly between desktop and mobile, you can access your list and unblock senders in just a few clicks. where to find blocked email addresses in gmail
Since you are already in the "Filters and Blocked Addresses" tab, you can block someone instantly without opening an email: Scroll to the bottom of this page
If someone keeps slipping through to your Spam folder, you need to Block them. If they are in your Inbox but annoying, you simply need to click "Report Spam." While the steps differ slightly between desktop and
Unblocking an address does not recover emails that were sent while they were blocked. Those messages are permanently gone. It only allows future emails to arrive in your Inbox.
[1] Google Support. (n.d.). Find and manage blocked emails in Gmail. Retrieved from https://support.google.com/mail/answer/81126