There are several ways you can send a campaign to customers who have been responsive to previous communications or redeemed certain promotions.
If a recipient uses a Sign-up form or redeemed a certain offer they will be tagged. You can create a group or a tag of customers who redeemed certain offer as in the image below:
If you want to target them again create a new email and head to the ‘To’ field. Look for the name of the group or the tag, you can add as many as you like and don’t worry if a customer is in more than one tag, they won’t receive duplicate emails.