The process for mobile devices varies slightly from the desktop experience. Note that you cannot view the master blocked list within the mobile app settings; you must locate an email from the sender. On Android Devices Launch the on your Android phone or tablet.
If you went to the "Filters and Blocked Addresses" tab and the email address isn't there, there are two possibilities:
Select and confirm your choice in the pop-up window . From Gmail Settings (Managing multiple senders):