Yep, I missed the bugzilla entry on this one. My bad.
As for the reason for not using a listerver, my user is actually trying to do the right thing. That being, drive her list members over to her blog and wiki to collaborate, vice shotgunning emails to the list.
In addition, our org's fledgling zimbra email policy is to dissuade users from creating huge cross-domain distros in an effort to get them to sign up for a zimbra account.