Release Notes
03/04/2026
Fact Sheets
03/03/2026
Ancillary Service Endorsement Fact Sheet

Ancillary service endorsements are used by mailers to request an addressee’s new address or the reason mail cannot be
delivered as addressed and to provide the US Postal Service with instructions on how to handle Undeliverable As Addressed
(UAA) mailpieces.

Publications
03/02/2026
Data Files
03/02/2026
February 2026 Nixie Volume

This spreadsheet contains the UAA statistics for February 2026.

Release Notes
03/02/2026
Release Notes
03/01/2026
Publications
02/27/2026
Data Files
02/27/2026
Undeliverable-as-Addressed (UAA) Mail Roll-Up 1998-2025

This spreadsheet provides a breakdown of Total UAA mail by mail class from FY1998 thru FY2025.

Release Notes
02/26/2026