USPS Mailing and Shipping Solution Center
The Mailing & Shipping Solutions Center (MSSC) provides centralized support for commercial mailing and shipping questions.
You only need to call our toll-free number 1-877-672-0007 Monday through Friday, 7:00 A.M. ─ 7:00 P.M. Central Time to reach our trained and professional Mailing Requirements staff, who can assist you with all your mailing and shipping needs.
