@sumudu there's a number from which they message me about alerts related to my car. I just replied to that. I think the number should be available in their docs.
But I've discovered a problem - a post has to be 160 chars or less. Twilio is supposed to break longer texts to smaller chunks, but either Google Voice doesn't send them, or ifttt rejects them. Somewhere along the way, my paragraph long journal entries are getting lost.