(sorry, the mobile app hides this trick). Click the gear icon (Settings) in the top right, then "See all settings."
Check your Spam and Trash folders. Gmail automatically deletes Spam after 30 days and Trash after 30 days. If the email address isn't appearing in your "Filters and Blocked Addresses" list, it is possible they were already unblocked or the block was never fully processed. how to unblock gmail contacts
This is the most reliable method if you have blocked someone in the past and want to find them again without having an email from them handy. (sorry, the mobile app hides this trick)
Are you having trouble reaching a contact on Gmail because you've blocked them? Don't worry, unblocking a contact on Gmail is a straightforward process that can be completed in just a few clicks. In this write-up, we'll walk you through the steps to unblock a Gmail contact. If the email address isn't appearing in your