AccuZIP Releases July 12 Rates and Rules Update

July 8, 2026

We're pleased to share that the AccuZIP July 2026 USPS Rate & Rules update is on track for the July 12, 2026 USPS implementation. This release delivers support for the vast majority of the USPS changes, helping customers remain compliant with the latest mailing standards while minimizing disruption to production workflows.

HIGHLIGHTS

The July release includes support for: 

• New 3-Digit pricing for First-Class Mail®, USPS Marketing Mail®, and Periodicals, replacing ADC/AADC pricing. 
• Updated Mixed container naming conventions. 
• New tray preparation logic for USPS Marketing Mail flats reflecting the elimination of bundling requirements. 
• Increased USPS Marketing Mail flat weight limits, including Carrier Route enhancements. 
• Updated Bound Printed Matter pricing and preparation requirements. 
• Revised tray, sack, pallet, labeling, container preparation, and Mail.dat requirements for supported mail classes. 
• Support for the latest Content Identifier Numbers (CINs), labeling lists, and Intelligent Mail® preparation standards. 
• Mail.dat updated to DTAC Database Standard Version 25.1.1.0. 
• New SCF Container Preparation and Grouping Support: The July release also includes comprehensive support for the USPS restructuring of SCF container preparation and mixed container groupings. 

As part of the transition from ADC/AADC pricing to the new 3-Digit pricing model, AccuZIP has updated presort logic, tray, sack, pallet, labeling, and Mail.dat generation to reflect the latest USPS preparation standards. These enhancements ensure mail is grouped, labeled, and documented according to the new container hierarchy while maintaining compatibility with PostalOne! and the July 2026 USPS requirements.

Periodicals Update

Because the USPS introduced extensive changes to Periodicals preparation and pricing, implementation has been completed in phases: 

• Mail preparation support is complete. 
• Final pricing calculations and printed documentation are scheduled for completion by July 11, 2026, prior to the USPS effective date. 
• Note: Until those updates are available, customers can continue to submit mailings through PostalOne!® and generate USPS documentation directly from PostalOne! as needed.
  • Resolved a referential integrity issue affecting Periodical Mail Flat generation.
  • Resolved an issue that could cause Periodicals Carrier Route presort processing to hang.

Updated Dependencies

• Postage Statement Updates: PS Forms 3602-R, 3602-N, 3600-FCM, 3605-R, 3541 
• Labeling List Changes: Postal Bulletin #22707, Effective 08/01/26; Mandatory 09/01/2026 
• DMM Drop Ship Tables as of July 5, 2026 
• Updated CIN Table (AZM032) 
• Updated Incentive Discounts
• PresortCOM.dll (v3.3.9685.13086)

Customer Verification

The July 2026 USPS Rate & Rules update includes one of the most significant structural changes to USPS mailing standards in recent years. Our development team has completed extensive implementation, testing, and validation, including comprehensive internal quality assurance and verification through USPS PostalOne!®.
While we are confident in the accuracy of this release, every mailing environment and mailing data set is unique. We strongly recommend that customers review their presort results, validate mail preparation and documentation, and submit test mailings to PostalOne!® prior to production to ensure the results meet their specific mailing requirements.

If you identify an issue that could affect mail preparation, acceptance, or delivery, please contact the AccuZIP Support Team as soon as possible at support@accuzip.com. To help us investigate and resolve the issue quickly, please include your presort folder, any applicable USPS PostalOne! export report of the issue, and a brief description of the problem.

We are committed to providing timely support and will make every effort to investigate and resolve any previously unknown issues as quickly as possible.

Looking Ahead

Support for the new Heavy Printed Matter (HPM) mail category will be delivered in an upcoming release, currently planned for August 2026.
We appreciate your continued partnership as we work to deliver timely support for the USPS's most significant mailing standards update in recent years. Our team remains committed to ensuring you have the tools you need to prepare compliant mailings with confidence.