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U.S. Postal Inspection Service

The U.S. Postal Inspection Service supports and protects the U.S. Postal Service and its customers by enforcing the laws that defend the nation’s mail system from illegal or dangerous use.

Toll-free number

1-877-876-2455

Main address

Criminal Investigations Service Center
Attn: Mail Fraud
433 W Harrison St., Room 3255
Chicago, IL 60699-3255
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