I am using AX 2012 R3.
The requirement is for "customer account statement".
When opened and selected multiple customer accounts irrespective of the purpose in the query(in the parameter dialog), those customers email addresses should flow automatically to the print destinations-- email section.
Thus, they can send the statements just by clicking on the OK button.
How about using customer primary contact token?
Looking at the code, it is sending report to the primary address of the customer.