For every single ad I post whether it is for a car or for parts I get flooded with these scam emails. They don't even know what they are "buying". I once put my x-wife for sale on an auto classified listing just to mess with them and sure enough, they had a "client" that was very interested. If I thought it was real I would've been happy to sell to the crazy b.... off! Of course they are all from England.
I've found the best defense is to right away report them as spam. At least with Yahoo their email will be blocked and if it is a Yahoo account, they will suspend it. What you'll notice is that they all come from free email accounts. Since I've been doing that it seems I've been getting far fewer scam emails. It is annoying though because it makes putting something on the classified listings almost useless.
