This website http://urbanlegends.about.com

is an excellent refernce point for the many emails we all get about scams. Many of these are scams in themselves, getting us to send repeated eamils or txts about non-existent scams.
However, they also tell you when one is genuine. I have had the above several times over a couple of years, and it genuine (ish) here's the report:

http://urbanlegends.about.com/library/bl..._fraud.htm

Stay vigilant, better safe then skint.. but check before forwarding or your txt bill may hurt!