Impossible to tell without a link to the supposed property. I couldn't find it on Trulia. If you post one, we can help you much better.
However, why are you e-mailing the agent? If it is legitimate, you need your own agent--someone to represent you. You definitely don't want to use the listing agent in making an offer or in representing you.
If it's a RealtyTrac property, then no--the listing isn't valid.... more