Scanning this code opens the phone's mail app with a message already addressed to you — subject and body included, if you want them. The person only has to hit send, which removes the two things that stop people writing in: finding the address and working out what to say.
No, and it should not. The code opens a draft in the person's mail app — they still read it and press send. Nothing is sent without them.
Yes, both. Pre-filling the subject is especially useful when you want the replies to sort themselves into the right place.
Then the scan will not open anything useful. If your audience might not have mail configured, print the address next to the code as a fallback.
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