Here's my latest reply to one of these types of E-mails:

This is not the first E-mail I have received about this type of arrangement. The others passed up on my offer to help them out. As with them, I wanted a little proof of their authenticity, so I asked them to have a picture taken of them holding a sign that read "QD RULES!" I was willing to help out if that could have been done and not yet have I received anything from them. The same applies to you. If you can do this, I can see what I can do for you. Thank you.

Later, QD.