If you are looking to unblock a specific email address in Gmail and want to ensure the sender's future emails go to your Inbox (rather than Spam) while understanding why they were blocked, here is the proper report and procedure.
If you've blocked an entire domain and want to start receiving emails from them again, follow these steps: how to unblock email on gmail
This method is ideal if you have deleted all previous emails from the sender or need to unblock multiple people at once. How to Unblock Emails in Gmail If you are looking to unblock a specific
