The easiest way to ship your envelope is to use your own mailbox. If the envelope doesn't fit into your mailbox, you can drop it off at the nearest USPS mailbox or post office. !! UPS !! If you chose UPS as your shipment method, please make sure NOT to drop your envelope off at USPS. Please only drop off at a UPS office or drop box. The shipment is prepaid. Any additional charges will be billed to our account.