Data Files
03/20/2024
Zone Chart and Exceptions Test Files for Zone 10

Download this sample Test file to help prepare you for the proposed Zone 10.  Zone 10 will be represented as follows in the Zone Chart files - A in the Zone Chart Matrix and 10 in the Exception File. The Zone Chart Matrix has only a single character field for the zone, while the Exception File has a two-character field.  The test files are encrypted - contact labellist.ncsc@usps.gov for the encryption password.

Please note important dates below regarding the official release date for Zone 10 in the Zone Charts Matrix:

  • Live data for Zone 10 data will be available in the June 1st Zone Charts Matrix release.
  • IMPORTANT: Zone 10 will not be effective until after the USPS July Price Change. The USPS July Price change is effective July 14, 2024. There will be a special “Do Not Use Until” notice for mail entered before this effective date.
Tech Guides
03/20/2024
Informed Delivery Mail.XML Mailer Guide

This is a guide for submitting campaigns to PostalOne! via Mail.XML electronic documentation (eDoc).

Tech Guides
03/20/2024
Informed Delivery Mail.dat Mailer Guide

This is a mailer guide for creating campaigns via PostalOne! through Mail.dat eDoc submission.

Tech Guides
03/19/2024
MASS™ Technical Guide for Cycle O

This document provides a technical guide for MASS™ Cycle O. MASS™ is an extension of the CASS™ system.

Tech Guides
03/19/2024
CASS™ Technical Guide for Cycle O

This document provides a technical guide for the CASS™ product. The CASS certification process is designed in cooperation with the mailing industry to improve the accuracy and deliverability of addresses for mail qualifying for postal discounts.

Contact Lists
03/19/2024
MPE (Mail Processing Equipment) Service Provider Licensees

Marketing contact information for certified Mail Processing Equipment (MPE) licensees 

Contact Lists
03/19/2024
LACSLink® Developers (PDF)

This document contains a contact list of LACSLink® developers.

Contact Lists
03/19/2024
LACSLink® Distributors (PDF)

This document contains the contact list of LACSLink® distributors. 

Contact Lists
03/19/2024
DPV® Licensees

This document provides a contact list of licensees for DPV®.

Tech Guides
03/18/2024