Unblock an Email Address in Gmail
Solutions for desktop and mobile devices
So, you opened your Gmail account, thought you were getting spammed, and blocked the email address. Now, you want to unblock that address. Unblocking is really simple, but the starting point isn't obvious. Here are three options that work on desktops and mobile devices.
Use this desktop method if you can open an old message from the blocked sender. Check the Gmail spam folder first, or use the search bar.
If the message is in the spam folder, click the Report no spam button to move the message to your inbox.
Open your Gmail account on a desktop
You could mass unblock a bunch of email addresses. Click Select: All.
Try this on a mobile device.
That's it.
After you unblock, you can receive messages from the sender.