With the release of iOS 7 this fall will come the ability to block spammers on iMessage and FaceTime. But in the meantime, Apple(s AAPL) has a solution for users of iOS versions 5 through 6 to put a stop to unwanted iMessages. Apple published details of an iMessage spam reporting tool on its Knowledge Base site late Tuesday. Users can email a screenshot of the message, and the offending email address or phone number to imessage.spam@icloud.com.