Pricing & Classification DMM Advisory

Message board to keep postal customers informed of changes to mailing standards, services, and prices.

September 7, 2016

New Tools Help Provide More Accurate and Timely Mail Delivery

The Postal Service® has made changes to the Delivery Point Validation® (DPV®) and Delivery Sequence File (DSF) products to now include new tables called Door Not Accessible (DNA) and No Secure Location (NSL).

The DNA table assists mailers by identifying addresses where carriers cannot knock on a door for mail delivery. Examples include situations where carriers cannot physically access a residence or building such as a rural/highway contract route (HCR), long driveway, or gated residence.

The NSL table identifies locations where there is no security. For instance, carriers can access the door, but cannot leave a package due to security concerns. Additionally, it lets mailers know locations where businesses are closed on certain days or are storefronts with no mail receptacles. This helps mailers know whether or not mail is deliverable to these locations.

The DNA and NSL tables are currently available in the DPV and DSF2 Hash Products.

If you need more information, contact the National Customer Support Center Licensing Department at 800-589-5766 or