Why choose postlight? Postlight showed incredible range—addressing not just the technical challenges, but also staying sharply focused on how the outcomes would affect our business. I've simply never had a closer, more valuable, or more enjoyable experience with an outside agency.What is international products services postnl? International Products & Services PostNL is the premier provider of postal and parcel services in the Netherlands.What does postnl do? PostNL is the premier provider of postal and parcel services in the Netherlands. We work closely with national postal services and private delivery partners in order to offer customers the most comprehensive and reliable network for delivery of their mail, packets and parcels – not just in the Netherlands but also abroad.