INFORMATIONAL - Time Limited Price Change - Scheduled Commercial Systems Release 9.21.2025

Submitted by PostalPro on Thu, 09/18/2025 - 15:29
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Announcements
Thu, 09/18/2025 - 15:29
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USPS APIs Release Notes

Submitted by PostalPro on Tue, 09/03/2024 - 11:49
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Release Notes
Thu, 09/18/2025 - 10:12
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CASS™ Certified Products Guide: Residential Delivery Indicator Cycle O - (Expires July 31, 2028)

Submitted by PostalPro on Thu, 11/09/2023 - 12:15
Types
Contact Lists
Thu, 09/18/2025 - 11:31
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Certified Mailing Professionals and Certification Programs

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

Submitted by PostalPro on Thu, 11/09/2023 - 12:12
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Contact Lists
Thu, 09/18/2025 - 11:06
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Certified Mailing Professionals and Certification Programs

First-Class Mail and Marketing Mail Growth Incentives FAQs

Submitted by PostalPro on Thu, 08/17/2023 - 17:19
Types
FAQs
Thu, 09/18/2025 - 13:37
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CASS™ Certified Products Guide: M L O C R Mailers/Users Data File Cycle O - (Expires July 31, 2028)

Submitted by PostalPro on Thu, 06/29/2023 - 12:10
Types
Contact Lists
Thu, 09/18/2025 - 11:14
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Certified Mailing Professionals and Certification Programs

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

Submitted by PostalPro on Thu, 06/29/2023 - 12:03
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Contact Lists
Thu, 09/18/2025 - 11:13
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Certified Mailing Professionals and Certification Programs

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

Submitted by PostalPro on Thu, 05/11/2023 - 12:15
Types
Contact Lists
Thu, 09/18/2025 - 11:12
Related Category
Certified Mailing Professionals and Certification Programs

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

Submitted by PostalPro on Thu, 05/11/2023 - 12:13
Types
Contact Lists
Thu, 09/18/2025 - 11:11
Related Category
Certified Mailing Professionals and Certification Programs

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

Submitted by PostalPro on Thu, 05/11/2023 - 12:10
Types
Contact Lists
Thu, 09/18/2025 - 11:07
Related Category
Certified Mailing Professionals and Certification Programs