[sudo-discuss] our mailing list system needs help

our mailing list system (postorius) is having problems... we're not sure what it is but it looks like some spammer is entering random addresses into the "join this mailing list" field and then our system is trying to email a confirmation to those addresses. Anyone want to log in and take a look at it, try to figure out what's going on, and figure out a way to fix it? We might need to add a CAPTCHA or at least a checkbox or some sort of puzzle so that people can't just automatically enter email addresses in and have us email them. -jake