Here's what I'd like to do. If you'd be so kind as to tell me if this is easy stuff with Limesurvey, I'd greatly appreciate it.
Limesurvey would pull a list of recipients from a feed.
Limesurvey sends unique URL to each recipient that will identify them. No login or filling out of user info needed. I will match unique URL with the results in my database.
Limesurvey would provide a feed of the unique ids and results.