Surveys: load to distribution - need to know why records fail to load

When I upload contacts to the Survey distribution tool via a csv file (containing contact IDs), I receive an email that says how many records successfully loaded. However, the email does not contain information about why a record failed to load. It would be helpful if the tool provided some feedback. In my example today, I figured out through trial and error that the record wasn't loading because the sfdc contact was missing an email address.