Z4 Info File | PostalPro

Site Index

Main Menu

Mailing and Shipping
Promotions & Incentives
- - USPS Mailing Services team provides strategic incentives, offering various benefits and advantages to businesses and individuals.
    
    All Mail Incentives
    
    Mail Growth Incentive
    
    USPS Mailing Promotions seek to increase engagement and response rates for Mailers by leveraging high value mailpieces.
- - 2026 Promotions Calendar and Technical Guide
    
    2026 Promotions
    
    For ideas on new or existing Promotions, please fill out this form.
    
    Looking to implement tech in your mail? Visit the Tech Directory.
Industry Forum
Operations
- - Find Your Local Business Mail Entry Unit
  - Make a FAST (Facility Access and Shipment Tracking) Appointment
Certifications
Resources
Contact

Breadcrumb

Home
Z4 Info File

Z4 Info File

A downloadable ZIP file containing information related to the Z4 Info File

May 07, 2026

Download

Quick Links

CASS™
MASS™
Z4CHANGE Product

Changelog

Updated Weekly

Feedback

Quick Links

Contact
Site Index
Update Via RSS

Helpful Links

Accessibility Statement
Business Customer Gateway
Postal Bulletin
Postal Explorer
USPS.com