In a closed thread below Craig writes:
I definitely don't want people joining to use the member list as a spam database but I'm at a loss of how we can solve this problem--

At least, you can remove the e-mail link from the lists, such as "site members". If you have to click on each members name to see if the e-mail is open, that is no big deal for legitimate use, but quite a hassle for "mass mailings".

Erik