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Example of desired outcome: I send a text to Twilio with directions of who to send to. Twilio sends message out to recipient. Recipient only observes that I sent the message.
I have worked with DKIM authentification to handle this problem for email, but I don't think much of it carries over.
In March they had just finished a 5.8 M round. http://techcrunch.com/2012/03/08/clover-raises-5-8m-from-andreessen-horowitz-launches-as-a-one-click-mobile-payments-platform/