I don't normally use Text2X10, and I only had it running for a few minutes to test it.
I'll open it back up and check it out.
After some testing, I'm not seeing any spam.
However, since I don't have a texting plan on my phone, I was using my own Google Voice account to send the SMS messages to the program.
Since Google likes to treat messages that you SEND as if you had RECEIVED them (just like in Gmail, they show up in your Inbox), they were showing up twice, and being interpreted twice.
So, the commands were being run twice, and I was getting two notifications.
When I tested by sending from my wife's Google Voice account to mine, it worked fine (command only ran once).
If I decide to start using this (it would be helpful, I guess), I'd probably have to set up a separate Google Voice account just for the text2x10 program to use.