To remove an address/alias, log in to your Pobox account using a web browser. From the Services page, find the Your Addresses section and click Remove Address to find the Remove An Address page.
You'll see a list of your aliases. Find the alias you wish to remove and click the corresponding Delete button.
A pop-up will appear asking you to confirm that you wish to delete the address. Click Delete Address.
You will then see a green banner confirming that the address has been deleted.
After an address has been deleted, mail sent to that address will begin bouncing mail immediately. Deleted addresses are held for your use for 60 days.