Umm, we strongly prefer that members have an active and useful e-mail account listed in their profile. Else we’re left with no way to contact members, should that need arise. In fact, it’s a requirement, if the registration agreeement is to be construed narrowly.
Alternatively though, you could simply set up a Spam filter for messages from the Straight Dope Message Board Mailer. The SDMB staff uses the e-mail accounts that have been made public so there’s never a question of authenticity; we won’t mail you from the SDMB mailer. You might miss some membership-wide distribution e-mail, but I think that’s been used exactly twice since these boards opened for business - both related to hacker activity with alerts to change your password.