Delivery Sequence File (DSF2) Processing


We recommend using DSF2 in conjunction with NCOALink® (National Change of Address) processing to update your list with customers who have moved in the last 48 months. It improves mail deliverability through address standardization and verification at the delivery point level, and by using the added walk sequence and saturation qualifies you for postal discounts.

What is DSF2?

  • Delivery Sequence File* – Second Generation (DSF2®) is an address accuracy tool that identifies addresses that are deliverable and addresses that are not deliverable.
  • DSF2® processing identifies address characteristics that enable marketers to distinguish between residential and business addresses, seasonal addresses, vacant locations and the mail delivery method – curbside delivery, door slot, NDCBU (Neighborhood Delivery and Collection Box Unit) or central delivery.
  • DSF2® also assigns walk sequence numbers and provides the documentation necessary to qualify for additional United States Postal Service (USPS®) delivery sequence postage discounts.
  • A Delivery Point Validation (DPV®) module confirms that an address is correct and is an actual USPS® delivery point. It also identifies if the address is a Commercial Mail Receiving Agency(CMRA).
  • All DPV® functionality is included in DSF2®. DPV® identifies if an address is missing secondary data (Apt#), or contains incorrect secondary data.
  • The DSF2 file retains every USPS® deliverable address in the U.S.  (over 162 million records).

Who benefits from DSF2

  • Saturation Mailers – Large, concentrated mailings will qualify you for postal discounts, reducing costs and maximizing revenue.
  • Special Interest Mailers – Appended delivery points give you specific information for your mailing list including:
    • Business and residential address
    • Seasonal address
    • Drop Point Flag with quantity associated the flag
    • P.O. Box Delivery Only
  • Mailers concerned about deliverability – DSF2 deliverability codes will help determine the deliverability of the addresses in your list. Addresses that do not match the DSF2 record probably contains an error.

How DSF2 processing works

  • DSF2® identifies whether a ZIP + 4® coded address is currently in the USPS® file as a known address record.
  • DSF2® identifies records from its database that contains vacant, residential, business and seasonal address information.
  • Identifies the type of delivery required at the location such as a door-slot  or curb-side mailbox.
  • Addresses that do not match are returned with footnotes and identified as possible errors.

DSF2 features

  • Provides Carrier Route Number, Carrier Delivery Sequence Number, Delivery Point Barcode (DPBC), Business or Residential indicator, Seasonal Code indicator and Occupied/Vacant Code indicator.
  • Reports Include: Footnote and Delivery Type Counts. National Deliverability Index. ANCHOR’s Deliverability Index Score and PS Form 3553 for CASS™ Certification.

Benefits of DSF2

  • Enables you to identify 3-6% of your mailing as potentially undeliverable
  • Improves mail deliverability through address standardization and verification at the delivery point level
  • Qualifies mail for additional walk sequence and saturation mail postage discounts
  • Saves on postage and material costs by eliminating undeliverable as addressed mail, i.e. non-existent, incorrect, or incomplete
  • Dedicated customer support
  • CASS  standardization
  • Identify delivery types such as curb, door slot, box, etc.
  • Learn if a property has been vacant 90+ days