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The holiday practice of swapping presents with loved ones near an far has surely forced a few people into a serious bind. For those sweating the idea that their package may not make it in time, check out the handy tool from USPS which will tell you how late you can send your packages off today in order to land on the recipients door tomorrow.

Go directly to the Express Mail Service Commitments page and enter the originating as well as destination zip. USPS will tell you the nearest mailing facility and at the time that you need to send it by.