With Delivery Sequence File Processing (DSF2) AmeriList and the USPS® can help you reduce undeliverable mail by identifying inaccurate and incomplete addresses in your database.

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Is Your Direct Mailing List Rattled With Holes?

Our Address Quality team can help you fill in those question marks using the Second Generation Delivery Sequence File. With our DSF2 service, we check your lists against the USPS® master database of 165+ million delivery points to help reduce returned mail.

Using the DSF2 file will help you:

  • Identify if an address has been vacant for more than 90 days
  • Improve address hygiene
  • Identify if an address is at a business or residential location
  • Improve Carrier Walk Sequence coding
  • Identify records that are seasonally occupied
  • Identify if an address is delivered to a curb-side mailbox or to a door-slot.

Reduce undeliverable mail today by calling our Data Processing Team and asking about our DSF2® file services. 1.800.457.2899 or email us at