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Have a feature where an SQL query creates a dynamic list that is new everytime it is run. We have SQL lists where in a certain situation, a user maybe included in, but then on other occassions, they're not. So we have to recreate the list every time we want to send an email to that query.
This should already be possible by using a SQL Query to aggregate recipients rather than using a List.
There is also the option to execute a SQL Query every time prior to using a List; therefore, you could write a SQL Query to clear the list and then import.