how to send overnight letter

how to send overnight letter with USPS involves using their Priority Mail Express service. You can drop off the letter at a USPS location or schedule a pickup for it. Priority Mail Express is the fastest USPS service and guarantees overnight delivery, typically by 10:30 AM the next day, depending on the destination. Ensure that the letter is properly addressed and that any necessary postage is affixed before mailing. For added convenience, you can also purchase and print postage directly from the USPS website.