Knowing how to use the block and unblock feature on Gmail is one of the drawbridges you have to protect your inbox. Blocking and unblocking your contacts in Gmail is a simple matter of two clicks.Unlock the "Most Useful Gmail Keyboard Shortcuts" cheat sheet now!This will sign you up to our newsletterEnter your EmailUnlockRead our privacy policy When you block a contact, messages from their addresses will end up in your Spam folder, but they won’t know they were blocked.