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10/09/2025
CASS™ Certified Products Guide: Vendor/Service Bureaus Licensees Cycle O - (Expires July 31, 2028)
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10/09/2025
CASS™ Certified Products Guide: DSF2® Licensees Data File Cycle O - (Expires July 31, 2028)
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10/09/2025
DSF2® Licensees Cycle O: Certified Products Guide - (Expires July 31, 2028)
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10/09/2025
DPV® Licensees Data File Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)
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10/09/2025
DPV® Licensees Cycle O: Certified Products Guide - (Expires July 31, 2028)
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10/09/2025
CASS™ Software Manufacturers Data File Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)
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10/09/2025
CASS™ Software Manufacturers Cycle O - (Expires July 31, 2028)
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10/09/2025
CASS™/MASS™ Certified Products Guide - All Sections Data Files Cycle O - (Expires July 31, 2028)

This document contains the certified vendors list for CASS™ and MASS™ products for Cycle O.

User Guides
10/09/2025
Provisioning Mail Quality Data with Informed Visibility® Mail Tracking and Reporting

Mail Quality Data (MQD-IV) leverages the Informed Visibility® Mail Tracking & Reporting (IV®-MTR) application to enable mailers to receive uncapped Mail Quality Data. Detailed error data from the Mailer Scorecard is available for Full Service, Move Update, eInduction, and Seamless Acceptance.

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10/09/2025
Mail Service Provider (MSP) - Full-Service Certified Mailers

A Mail Service Provider (MSP) offers a variety of solutions to prepare and present Full-Service presort mailings. For more information regarding Certified MSPs, please follow this link: https://postalpro.usps.com/full-service-cert/fact-sheet