Traycbay

I opened an email last week from greetingcards.org that said I had received an E-card, as soon as I opened it the Antivirus 2008 popped up and I ended up trying so hard to delete i deleted some of my hardware and had to buy a new laptop. The problem is I am getting more emails from greetingcard.org and I cant block them, I'm scared I may open it accidentally. Is there anyway I can prevent it from coming in?