In Coupon Reach, there is a way that you can set up a campaign to block duplicate subscriptions from the same person only for a period of time. So think of a person who subscribes to the campaign for the first time for an offer. If the business wants to have them subscribe again to get the same offer after a period of time has passed. If that period is not over yet, they won't be able to subscribe to the campaign again just yet. 


To set this up, follow the steps below:


1.  Go to the campaign properties of the campaign of your choice.


2. Go to See More > Subscriber Duplication.


3. Enable the Disable Subscriber Duplication option and tick the other Disable Subscriber Duplication option that will  show up:


4. Enter the number of days you would like the refresh period to last: