I'm working on it. I have several ideas about how I'm going to handle this problem. If you send more than 100 messages in a given amount of time you're presented with a pop-up dialog box (see below) that you must click in order to continue sending. 100 messages seems to be the limit on Verizon in the Android OS though I do not know the period.
Sending SMS Messages -- Unknown application A large number of SMS messages are being sent. Select "OK" to continue, or "Cancel" to stop sending.