Also, to the extent that mailers send broadly to all destinations, a system of this kind would not change postage bills, it would just increase some rates and decrease others.
There will be new postage bills for the changes to be implemented. 
mnli hypothesis: There will be new postage bills for the changes to be implemented.  premise: Also, to the extent that mailers send broadly to all destinations, a system of this kind would not change postage bills, it would just increase some rates and decrease others.