How can I contact my carrier for support?

USPS

Stamps
(877) 782-6739 (option 1) (Hours: M-F, 6am to 6pm PT)
ShipperSupport@Stamps.com​

Express 1
(800) 399-3971
E-mail Form

Endicia
(800) 576-3279 x130 (Hours: M - F 6am to 5pm PT)
Knowledge Base
E-mail Form
 

UPS

Customer Service: ​(800) 742-5877
API Technical Support: (800) 247-9035
Knowledge Base & Contact Phone Numbers
E-mail Form

UPS Mail Innovations
(800) 500-2224
Direct E-mail
Knowledge Base
 

FedEx & FedEx SmartPost

1 (800) 463-3339
Phone Number Department Directory
Knowledge Base
E-mail Form
 

Fulfillment by Amazon

Amazon US
Knowledge Base
Technical Support (Seller Login Required)

Amazon UK
Technical Support (Seller Login Required)
Submit a Support Ticket

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