[ada1981]

Can you build feedback into the app from the start? This sounds like a good idea but you will have to market it. You might try having people agree to a follow up call after the interview to get feedback from them before they do the interview.

Do you have their phone numbers? Call them directly. Your email might have gone to the promotions tab... I wouldn't give up so quickly.

[hschool]

I have their email addresses. I offered to do free mock up interviews for them, but no one was interested. It could be that they didn't need the service and were looking to use it once it became available.