Saturation Carrier Route postal discounts are available for mailings that meet density requirements and are sorted in walk sequence (DSF).  In addition, the DSF file can be used to validate each individual address record.  The Delivery Sequence File is a file that contains all addresses serviced by the Postal Service.  Each record contains Zip+4, Carrier Route, Delivery Sequence, Delivery Type, and Seasonal Delivery Information.  The provision of information from the DSF product is controlled by the approved address matching logic.  NO DSF address information is provided without reference to an existing address on a mailer's list.  Additionally, the DSF product contains NO change of address information.  This coding allows placement of the mail pieces in the exact sequence that the mail carrier for the carrier route will deliver the mail.  The postal presort required to receive these discounts does require additional processing.

You receive the following from DSF processing:

• Address Validation
• Address Standardization
• Zip+4 Coding
• Carrier Route ID Coding
• Delivery Sequence Coding
• Detection of potentially undeliverable addresses for reasons other than a change of address
• DSF information provided on electronic media
• Cost savings through improved address list quality