To unblock addresses from your blocked sender’s list:

Go toSettings.

SelectView all Outlook options.

To remove an address, select thetrash cannext to the email address.

Outlook.com interface.

This also works on addresses blocked with a Sweep filter.

Or selectMail>controls>Junk Mail>Blockedto directly access and manage your Blocked list.

View all Outlook settings link

Viewing Junk email options within Outlook.com website

Saving Junk email options within Outlook.com website