Outlook provides the user with the option of unblocking email address that has been blocked in the past. Unblocking is as easy blocking in the Outlook. Here are steps and instructions on how to unblock am email address in Outlook : -
Go to the settings and click the ‘View all Outlook settings’ option.
Select the mail option that will appear in the bottom of the screen and go to Junk Email.
Under the Block Senders and domains where all the email addresses that have been blocked are there, click on the email address that you want to unblock and select on the ‘dustbin’ icon. Select the Save option. The email address will be unblocked.