Most do because it's a regular street address with a box number (on the second second address line). A USPS PO Box has no street address and has "PO Box 123" on

Most do because it's a regular street address with a box number (on the second second address line). A USPS PO Box has no street address and has "PO Box 123" on the first address line, so it's easy to identify and prohibit. If anyone's considering this, other popular vendors are https://www.virtualpostmail.com/ https://www.virtualpostmail.com/ and https://travelingmailbox.com/ https://travelingmailbox.com/