Also, make sure its DCN able. It has to be so thick, etc. You can't put it on a regular envelope, it has to technically be a package or priority If you go to USPS.com you can find the exact dimensions that they are requiring. Also, you have to put the DCN stickers to the left of the address. All this can be done in the comfort of your home/office. Make sure that there is sufficient postage. I believe its 60 cents for DCN on top of the regular posting.