Don't put the e-mails up in the forum. Rather, just start a moderated listserv. A number of sites offer the "mailman" list management program. You can add the e-mail addresses to it, keep them invisible, and leave the e-mail list open to messages from anyone who would send them, subscribed or not. If you ran it in moderated mode, you'd have final approval before something got out which could keep away unwanted spam. That would be a way of doing it if people are concerned about privacy and spam.