(the three vertical dots) in the top right corner of the message. Select "Unblock [Sender Name]" from the dropdown menu. Confirm the action in the pop-up window. How to Unblock via Gmail Settings (Desktop Only)
This is the most common way to manage your blocked contacts. how to unblock people in gmail
This method is often the fastest if you still have a past conversation with them. (the three vertical dots) in the top right
No. Google does not send a notification to the person when you block or unblock them. How to Unblock via Gmail Settings (Desktop Only)
Accidentally blocked a contact? Or perhaps you buried the hatchet with an old adversary and want to restore communication? Gmail makes it easy to block people, but unblocking them isn't always intuitive.
If you have an email from the sender (check your folder if you don’t see it in your Inbox), you can unblock them quickly: