I guess I don't understand the question. If they change the e-mail address and want it posted...shouldn't they just do it themselves...if they WANT to get e-mails they'll do so...if not, then talk to your cousin by regular e-mail..
Am I alone in wondering why you are obsessing about this???
If you want to talk to your cousin, call and leave a message...or are you talking about a Geni cousin????