Surveys: More friendly error message

I am using single question surveys at the bottom of emails to ask the reader if the email is helpful or if they want to receive more info. As I encourage readers to forward the emails they receive to their network, when someone who received the email via my recipient wants to click on the question, they obviously get rejected but the message is not user friendly at all.

Any plan on improving the error message presented to invalid recipients when they attempt to connect to a survey they are not part of? It would be even better if we had the option to allow a survey to accept new survey recipients on the fly.