Announcements
02/06/2026
INFORMATIONAL - MAILER ID (MID) Validation for Payments POSTPONED
Announcements
02/06/2026
Deadline Extension 2026 NPF Ticket Contest
Release Notes
02/06/2026
Informed Delivery API Release Notes V1.2
User Guides
02/05/2026
Mailing and Shipping Solutions Center (MSSC) Topics

List of topics the MSSC can assist with. To reach the MSSC, email us at MSSC@usps.gov or call 1-877-672-0007 from 7:00AM – 7:00PM CT.

FAQs
02/05/2026
Plus One FAQs