The USPS Mailing & Shipping Solutions Center (MSSC) is open to provide centralized support for commercial mailing and shipping questions. The MSSC is a commercial Help Desk that provides customers with assistance and solutions on mailing requirements and mailpiece design. These assistance and solutions ensure compatibility with automated mail processing and compliance with:
- Mailing standards
- Automation readability
- PostalOne! .
- Enterprise Payment System Accounts (including ACH or W-9 form requests)
Contact Information:
Hours of Operation:
- Monday through Friday from 8:00 a.m. to 8:00 p.m. Eastern Time (7:00 a.m. to 7:00 p.m. Central Time)
- Saturdays: Closed
- Sundays: Closed
- Holidays: Closed
