New email name is not seen in email campaign

In a recent email campaign we changed the FROM address descriptor from Joe to Helen . When my client received the newsletter, he complained that the descriptor was still Joe, instead of Helen. He proceeded to FWD me the newsletter. The FWD newsletter included Helen as the FROM, not Joe. That was the clue I needed to help the client out. You see, the client was using Thunderbird to read emails. In the past, the client replied to the newsletter and the Joe descriptor was saved in the collected address book. A search for the email address in all the address books in TB revealed that to be the case. We deleted the Joe email addresses and instantly the FROM became Helen in the inbox view. Pretty Neat!