I think creating al list in Geni containing email addresses isn't possible
So try: messages (in between the search box and your name) -> new message and then choose one of the options from 'add group' (like 'family')
5/1/2012 в 2:10 после полудня
Geni had an option for that before, but I don't remember where the link for that was.
Anyhow most people hide their email, so it would be useless.