with Viaddress? funny, i read the help file and it says:
"Do I need to submit USPS Form 1583 ?
WE DO NOT NEED THIS FORM IF YOU'RE SHIPPING VIA FEDEX, UPS, DHL FROM THE VENDOR.
We only need this form to receive packages shipped from vendors via USPS. Again, we do NOT need this form to receive packages from vendors who ship via FEDEX, UPS, DHL or any other carrier. Most of the time, you can select the shipping carrier at the checkout process from the Vendor's website. Select any other carrier than USPS, and you will not need to provide us with this form
Due to USPS regulations, all new customers must complete USPS Form 1583 in order to receive shipments from USPS. Viaddress may not accept mail from USPS until we receive Form 1583, authorizing Viaddress to accept mail on your behalf. This is a one time requirement by the USA government and we can’t waive it.
Once you complete the USPS Form 1583, please e-mail it as an attachment to
service@viaddress.com, or mail it to:
VIADDRESS Distribution
530 East Lexington Ave
Suite 135
ELKHART, INDIANA, 46516
United States"