Once you unblock a sender, Outlook will allow their emails through, but the system might still flag them as "Junk" if they contain suspicious links or images. To ensure their emails go straight to your Inbox, consider adding them to your list.
If you use the classic or new Outlook desktop app, the menus are slightly different but follow a similar logic. how to unblock an email on outlook
If an email has been blocked because the sender is on your blocked senders list, you can unblock them by following these steps: Once you unblock a sender, Outlook will allow
: Under the Blocked senders and domains section, you will see a list of all currently blocked addresses. Once you unblock a sender