Ask HN: Site selling my email address... anything I can do?

Hi all, I registered a while back for corporate perks (http://www.corporateperks.com/), another site which claims to use collective bargaining based on what employer you work for. I removed my account shortly since I learned they didn't have anything for Ireland. Ever since, I am getting few advertisement emails from some third parties (US specific). Now, I have a strong reason to believe they sold my id to spammers, since there we only 2 websites who knew it (other being facebook). + I never shared my email to any forum etc... And from the nature spam emails (mainly sent to entice managers et al), I can be fairly sure that it www.corporateperks.com.

I am really annoyed by that, thanks to my spam-intolerantness. Is there anyway I can stop this, fight back?