Sounds fishy - however, depending on how much info was in the add - it might be legit - just someone with no social skills at all. I would call and tell them that you only accept cash and if that is ok. If they start in about a money order - you know that it is a scam and to contact the sherriff.
DO NOT give them your address until they tell you that cash is ok. Typically they will not list a phone number, only an email address for correspondence.
I would just call the #. Some people who use e-mail all the time for work are very short and to the point. Others, like DH, just never know what to say. He won't even leave a message on anybodys machine.