Priority Mail Express 1-Day is not available ShipAccel
Learn why Priority Mail Express 1-Day service may not be available.
Products affected: ShipAccel
The 1-Day option for Priority Mail Express is not shown. It only shows 2-Day availability.
The cutoff time for Priority Mail Express 1-Day has passed.
Priority Express 1-day cutoff varies per USPS facility. To find your USPS facility’s 1-Day Drop-Off By cutoff, visit https://postcalc.usps.com/.
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UPDATED: November 04, 2025