If you've added someone to the Safe Senders list but now want to remove them (which is essentially unblocking them if they were previously blocked), you can do so by:
Are you tired of having a digital grudge match with someone on Hotmail (now rebranded as Outlook)? Do you wish to unblock a contact who was previously sent to the digital void? Look no further! Unblocking someone on Hotmail/Outlook is a straightforward process that can help you reconnect with someone you previously blocked. how do i unblock someone on hotmail
If you can still find an email from the sender in your Spam folder, open it and click the "Unblock sender" button located in the gray box at the top of the message. From Settings (Centralized List): Open Gmail on a desktop browser. If you've added someone to the Safe Senders