Typical mystery shoppers are signed up with dozens of mystery shopping companies, and our inboxes may be flooded with hundreds or thousands of emails about open mystery shops every month. If a company sends you a bunch of offers and you never accept one, will they blacklist you and stop offering shops?
First of all you need to know that you are not the only shopper getting those emails. Each notification is going out to many other shoppers in your area. It is not necessary to respond to the emails and say that you are not interested. You only need to take action if you want the assignment.
Even if you respond and say that you are interested in doing the shop you are not guaranteed the assignment. The email went out to hundreds of other shoppers in your area, and one of them may get the shop.