How to Unblock an Email Address in Gmail
A handy hack for desktops and mobile devices
Blocking messages in Gmail sends emails from a specific address to your spam folder. If you need to unblock an address, the path is not so obvious. Let me show you three solutions.
Use this desktop method if you can find and open a previous message from the blocked sender. Use the search bar or check the spam folder.
If the message is in the spam folder, click the Report no spam button to move the message to your inbox.
On your desktop:
Optionally, mass unblock email addresses by clicking Select: All at the bottom of the email list.
Use this method on a mobile device.
You're all set.
Once you unblock an email address, you can start receiving messages from the sender.