US Postal Traffic Disrupted by Tariffs September 2025 - Cornerstone Services, Inc. US Postal Traffic fell 80% in Sept 2025 as new tariffs ended duty-free exemptions, halting low-value parcel shipments worldwide.

MAILBAG WEDNESDAY | U.S. postal traffic drops 80% as new tariffs end the “de minimis” exemption. Global parcel shipments now face duty collection and customs delays.

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