Branding the "From" Field in Emails

So, there's this company Iconix that identifies email senders and displays their logos in recepients' inboxes - straight in the "From" field. A wonderful idea, only that for now it only works in Yahoo! Mail accessed with IE and requires a plug-in a confirmation email for which never came. The idea of branding the "from" field rocks, though.
-- via Clickz