Then click on Tools/Message Rules/Blocked Senders List

Then navigate to the Contact you want to remove
(they run from oldest to most recent at the end).

Then select their address, be sure to leave the checkmark checked.

Then select Remove, and OK.

You will then be prompted with are you sure?
Select Yes.
Email from this contact will no longer be "Blocked"!
Take me back to the main HOWDOI page!