@andyjean
Craigslist post this on your listing and also have the same information when you receive an inquiry through Craigslist.
http://www.craigslist.org/about/scamsIts best to list your item without a phone number and email address. Have the buyer contact you through Craigslist. (Look above when you list. Pick how you want to be contacted.)
Get a email address only for Craigslist posting. You will not stop all scams attempts but you will get less. You will also eliminate non wanted spam and text messages.