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Release Notes
08/28/2026

October 2026 - Timelimited Price Change Release

Release Notes
08/28/2026

USPS APIs Release Notes

For the latest updates, please review the USPS APIs Release Notes.

08/27/2026

PCCAC Certification Webinar: Postal Shipping Products Deep Dive with Catherine Knox

Announcements
08/27/2026

DELIVERY - Big Sur Post Office (03920) - Temporarily Closed

Release Notes
08/27/2026

PTR2 Release Notes_DD_08_27_26

Data Files
08/27/2026

Informed Visibility® Mail Tracking & Reporting (IV®-MTR) Development Tracker

This document provides a list of active IV-MTR work to be as well as items completed in the current fiscal year.

*Please note, Postal Pro is the only source for a current IV-MTR Development log as updates will be made on an ongoing basis.

Contact Lists
08/27/2026

CASS™ Certified Products Guide: Residential Delivery Indicator Cycle O - (Expires July 31, 2028)

Contact Lists
08/27/2026

RDI™ Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)

This document outlines the CASS/MASS certified vendors list for RDI™ Cycle O.

Contact Lists
08/27/2026

CASS™ Certified Products Guide: M L O C R Mailers/Users Data File Cycle O - (Expires July 31, 2028)

Contact Lists
08/27/2026

CASS™ Certified Products Guide: M L O C R Mailers/Users Cycle O - (Expires July 31, 2028)

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