I've been having this issue, and I'm curious if it happens to anyone else and what you can do about it. I put a "hire me" page on one of my sites to do IM, and I've gotten a few responses, but I know at least a couple of them were completely bogus. I just got another one, did a google search for the Email, and found it was someone from Pakistan advertising an email extractor. How am I supposed to know which emails to actually follow up with and which ones are these extractor schemes?