at first it was funny now it's just annoying

I've gotten three of these so far. From different people. Or the same person under different names.

Hey This is hard for me because I have never done anything like this.. but I have a huge crush on you. I have never been able to tell you for reasons which you would quickly identify as obvious if you knew who this was. I'm really attracted to you and I think you would be wanting to get with *Read FULL Card Here* dating.unudulmaz.com

are you getting these? how do we stop them?