re: Why is the mail so slow?

quote:

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the mail never stops moving, only delivery days

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Correct, but that doesn't mean USPS is running full transfer routes on holidays, etc.

I know UPS and FedEx adjust their schedules to account for the lack of shipments/pickups on the holiday. For instance, it may have still left the shipper's location, but then dropped at a DC and normally transferred the same night. But since there is no immediate need to move freight that evening, it may have sat there for a night, which is now moving on Saturday or Sunday to its next DC.