We are a construction company and when we send a SMS to our employees notifying them of a job, we would like for the SMS sent to receive either a confirmation/proof that it has been sent and read or better still for them to have to reply back with a unique 4 digit code. Many of us have that with our Dentist and our Mecanic here in Quebec, Canada, and we feel it’s a must have tool with SMS.
Commenting to signal boost. It would be very useful to learn more about this
I would love to learn how to do this also, whether by sms or email. Or even, giving that I would like to do this in house, a case to click to confirm reading 
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