rerunning addresses thru NCOA marked as DNM

My understanding of the NCOA utility is that it does not repull an address in the future if it has been returned once as invalid address (NCOA$DNM).  Does anyone know if there is a way to override this?  It seems like it is possible, depending on when you run your utility + when someone submits their address change details to the USPS, that there could be updates to an address at a later date.  If the address is always suppressed in the subsequent utility runs, then we will not get that address.

Thanks.

Kristina