Do I Need to NCOA My Data File? In a Word, Yes.
National Change of Address (NCOA) is the USPS registry of people who move or change their address. The Post Office requires all First-Class Mail and Standard Mail lists to be run through the NCOA database and updated within 95 days prior to mailing, in order to qualify for automated postage rates.
Updating NCOA Changes for Maximum Postage Discounts
A key component to the effectiveness of NCOA processing is updating the changes in your house file. The NCOA system maintains updates for 48 months and after that time, the address changes are removed from the USPS database.