There may have been one or more reasons the package was rejected. For example, packages destined for Iran, Sudan, or Cuba that lack a description of the content of the package can be rejected by the shipping company. If a package destined for Iran or Sudan contains a personal gift, but exceeded the stated value of $100, the shipping company is required to reject that shipment. If a shipment to Iran, Sudan, or Cuba contains unauthorized commercial goods, the shipping company is required to reject that transaction if no OFAC license is also referenced in the shipment instruction. These are legitimate reasons for shipping companies to refuse to process such packages. Not only could you be liable for attempting to send such packages, but the shipping companies also could be liable for their role in processing them, which is why they reject certain shipments.