If you went to the "Filters and Blocked Addresses" tab and the email address isn't there, there are two possibilities:
The mobile app does not currently allow you to view the full list of blocked addresses, so you must use an existing email to unblock someone . Open the . how to unblock an email on gmail
Sometimes, an email address is not officially "blocked," but a custom filter is automatically routing their messages to the trash or spam folder. If you went to the "Filters and Blocked
Open the email and tap the icon (three vertical dots) in the top-right corner of the message body . Select Unblock sender . Important Considerations How to Unblock Emails in Gmail how to unblock an email on gmail