USPS Express Mail Overnight Guaranteed it reads in large print. When you go online to find postage between the 2 zip codes it tells you the delivery commitment is one day. I had some product shipped I needed desperately the next day. It wasn’t there the next morning. I went to the post office website and if you punch in the 2 zip codes it tells you that it should be delivered the following day. It turns out you have to read further down and click on yet another box to find out that it has to be dropped off by 1245pm. I am going to be out thousands because the USPS deals in fine print. It should be called Express mail 1 to 2 days (maybe 3) not Overnight Guaranteed.