An Anonymous Coward writes: "Yahoo! Groups, who manages former eGroups mailing lists has a strange policy on unsubscribing people who joined eGroups via e-mail subscription before eGroups have been taken over by Yahoo!--the only way to unsubscribe is to join Yahoo! (giving your full details and a corect e-mail address) and then unsubscribe using the Web interface. The e-mail unubscription feature, although theoretically still available, does not work. Looks like not all Yahoo! Groups subscribers are equal."