I don't know if your email is a scam or not but I have been a mystery shopper for several years. If you're interested in becoming one the best web site to start with is www.mystershop.org. There you can get a free 'silver' certification or a paid 'gold'. There is a listing of hundreds of mystery shop schedulers.
The best way to get started is to sign up for 50-100 organizations as you will not be able to establish which ones have shops in your area before signing up with them, so the more you sign up for the better. If would be beneficial to get a separate yahoo or gmail account just for mystery shopping. DO NOT ever pay to sign up to be a mystery shopper as these are always scams. It took a few months for me and I signed up to over a hundred organizations but now I mystery shop steak houses, bowling, clothing stores, hotels, and amusement parks. Can't wait until my kids are grown so I can do cruises, vacations, etc.
Mystery shopping will not ever be a 'job' replacement but it can afford your family a higher lifestyle than you could normally afford. The main point is to be reliable. If you 'flake out' on assignments, you will be blacklisted as these companies do share that info among themselves. Good luck!