I don't have a dog in the fight as my email (which isn't my own domain) has very good spam filtering tools, but to be perfectly honest, the apparent lack of concern of this issue by IB is very disturbing. Either someone (or if not a specific person, some automated system) involved with IB is purposely using information to send spam (and I don't think it is a mod for the same reasons SkiAdcock mentioned above), or they're not and the system is being hacked into. Either way, I'm amazed that the only solution and level of caring is just shrugging shoulders and saying "oh well".