Always be certain you are dealing with the actual owner / landlord when leasing any property.
Their typical ploy is to find an old listing from the MLS - this lease listing expired in 09, MLS #P658831, and a for sale listing was recently priced at $575k - and advertise it at a RIDICULOUS price, ( Last rate was $2500/month) and get some Rube to send them a cashier's check for the first month's rent plus security - $1700, in this case.
Obviously, there are a LOT of Rubes out there, as they've been doing this scam for a few years now.
Send a cashier's check to Nigeria, and expect the keys back in the mail?
Stop being so stupid, people.