I need to send a reminder email to the ones that have registered for an event via a registration page. The responses from the registration page are being captured in the External responses table of the Adobe Campaign.
I do not know if the table you are storing the data has a target mapping created .
You can simply query the table where the responses are stored and send the delivery. if the table has a field like email and there is no target mapping created , you can create a custom target mapping to target that field of the table.