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ACS™
Phone: 877-640-0724, option 1
Email: acs@usps.gov
AEC/AEC II®
Phone: 800-238-3150
Email: aec@usps.gov
CASS™ MASS™
Phone: 800-642-2914
Email: cassman.ncsc@usps.gov
Intelligent Mail®
Email: intelligentmailsupport@usps.gov
Intelligent Mail® Tray Label
Phone: 800-238-3150
Email: imtl@usps.gov
NCOALink®
Phone: 800-589-5766
Email: ncoalink@usps.gov
PostalOne!®
Phone: 800-238-3150
Email: postalone@usps.gov
RIBBS™
Phone: 800-238-3150
Email: RIBBS@USPS.GOV
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Mail Delivery Issues
Phone: 1-800-ASK-USPS (1-800-275-8777)
Hours: M-F - 8:00am-8:30pm ET
Sat - 8:00am-6:00pm ET
Sun/Holidays - Closed
Email: Email Us
Package Tracking Issues
Phone: 1-800-ASK-USPS (1-800-275-8777)
Hours: M-F - 8:00am-8:30pm ET
Sat - 8:00am-6:00pm ET
Sun/Holidays - Closed
Enter tracking number: Track & Confirm
Email: Email Us
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