I tested it out and this is what it says:
"Thanks! You can reach me at [my number]. Could you please reply with your email so we can add it to our list?"
"Thanks! You can reach me at [my number]. Could you please reply with your email so we can add it to our list?"
I can see the benefits of the pitch that people only need to text the codeword but you could presumably extend the service to offer greater parsing of message content e.g. people can text the codeword, name and email and you parse them out rather than ask people to reply again with their email address.