[nznog] Procedure for handling a new spammer

There's a new outfit who seem to like bulk unsolicited email. It's pretty annoying as they're using Iconz as well and while I'm not totally clear on the specifics, this can't be good for any Iconz customers like me who don't want to be RBLed through someone else's behaviour. I've sent the spammer a short and sharp email as well as a note to abuse(a)iconz, is there anything else worth doing to help stop it in its tracks?