Labeling List Changes (December 2021)

Effective January 1, 2022, we are revising Labeling List(s) L009, L011, L012, L014, L015, L051, L201, L601, and L605 to reflect changes in mail processing operations. Mailers are expected to label according to these revised lists for mailings that are inducted on or after the January 1, 2022, effective date, but no later than February 28, 2022, expiration date. The changes will be published in the Postal Bulletin, Issue #22587.

 

Mail.XML Technical Specifications R53.0.0.0 (Version 2)

This document contains information pertaining to Mail.XML and the USPS PostalOne! Release 53.0.0.0 taking place in August 2021.

Mail.dat Technical Specifications R53.0.0.0 (Version 3)

This document contains information pertaining to Mail.DAT and the USPS PostalOne! Release 53.0.0.0 taking place in August 2021.

Proposed Sample Zone Charts

Mail.dat Technical Specifications R52.1 (Version 1)

This document is a comprehensive technical guide that outlines steps for exchanging electronic data with the PostalOne!® system using the Mail.dat® file format.