How Do I Send Priority Mail (Flat Rate Mailing Envelope)?

Sending a Priority Mail flat-rate envelope requires the use of specific materials that are free from the United States Postal Service (USPS). You can get the supplies at any USPS office or you can request free supplies online from the USPS website, https://store.usps.com/store. Priority Mail envelopes are made from a synthetic source trade-marked as Tyvek, […]

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