- communication with the source of the unsubscription

- access to the mailserver, use of a locally held gateway such a p2p remailer, or in-depth work with greg

- either development of a lot of novel software or prior experience engaging something like this

I don't have any of the above, that I am aware of, at this time, but I think I'll try to direct my feelings toward something like the p2p remailer concept.