That sounds really great, doesn't it? So does some guy in Africa wants to send you money, Coke will give you money or a life time of soda for giving them your personal info, etc, etc. Unfortunately, the old adage still applies "If it sounds to good to be true, it probably is." If an email ends up in the spam folder, unless you know the sender, it's probably (99.9%) spam. Even if it is sent from someone you know, be careful. Look for obvious signs of spam, like a lot of mispelled words, sentences that don't make sense, sent to multiple people with email addresses like yours, (yourmail@whoever, yermail@whoever,yoremail@whoever, etc.). Find out yourself, go to a store and try to get points. They will probably just laugh at you, and that doesn't sound good.
Shopkick is totally legit. I have been using it for over a year. You get kicks for walking into certain stores and also for looking at the "books" in the app, scanning certain items in store, and by using a linked credit card at certain stores. The other person who answered needs to ensure they are informed before giving information. Incase you are wondering yes I have redeemed Shopkicks and the gift cards are real.