I am assuming that is also a scam. If you haven't entered the lottery (in the first scenerio), or filled out all of the necessary paperwork to obtain a "green card" no one who is legitimate is going to contact you about one. And no one who is legitimate is going to contact you on your e-mal if you haven't already given your e-mail address to them. If you have not knowingly given whatever company is contacting you your e-mail address, I would assume that it is not a legitimate solicitation.