Software & Apps MS Office Remove All Blocked Senders in Windows Mail or Outlook Share Pin Email Print barisonal/Getty Images MS Office Outlook Word Excel Powerpoint By Heinz Tschabitscher Writer A former freelance contributor who has reviewed hundreds of email programs and services since 1997. our editorial process Heinz Tschabitscher Updated June 24, 2019 If you have used Windows Mail or Outlook Express you have probably blocked a number of senders and domains. What if you want to start anew and delete all the blocks you have set? Sure, you can go through the list and remove one entry at a time. Or you delete them all at once. Remove All Blocked Senders at Once in Windows Mail To delete all addresses from your list of blocked Windows Mail senders: Go to your Windows Mail settings in the Windows registry.Make a backup copy of the list of blocked senders.Click on the Block Senders List key with the right mouse button.Select Delete from the menu.Click Yes to confirm the deletion. Remove All Blocked Senders at Once in Outlook Express To empty your list of blocked senders in one go in Outlook Express: Go to your Outlook Express settings in the Windows registry.Make a backup copy of the list of blocked senders.Click on the Block Senders key with the right mouse button.Select Delete from the menu.Click Yes. That's it. Outlook Express should start with an empty list of blocked senders now. Note that this method of deleting blocked senders removes both the list of blocked email and the list of blocked news senders.